underflown.

Brit.

/ˈʌndəfləʊ/, U.S.

/ˈəndərˌfloʊ/

Etymology: under- prefix¹ 2b(c).

1. An undercurrent. Also figurative.

ΘΚΠ

the mind > mental capacity > knowledge > hiding, concealing from view > [noun] > hidden tendency or activity

under-water1618

undercurrent1792

undertow1817

underplay1845

underswell1849

nigger in the fence1850

nigger in the woodpile1852

underflow1854

—— in the woodpile1857

undernote1857

undertone1861

underdrift1891

under-belly1962

the world > the earth > water > flow or flowing > current > [noun] > under-current

underwork1610

underflood?1615

undercurrent1684

underset1815

undertow1817

subcurrent1822

underdrift1849

under-draught1853

underflow1854

under-water1859

undercarry1894

underrun1894

turbidity current1939

1854 S. T. Dobell Balder xxiv. 169 That underflow and subterrene Wherein the future heaves.

1875 J. Croll Climate & Time viii. 133 An underflow of polar water south into the Atlantic.

2. The (more or less horizontal) flow of water through the ground, spec. underneath a river bed.

ΘΚΠ

the world > the earth > water > flow or flowing > [noun] > flowing under ground

undercreeping1398

underflow1890

1890 Rep. Secretary of Agric. 1890 (U.S. Dept. Agric.) 472 Papers on underflow and subterranean water.

1890 Rep. Secretary of Agric. 1890 (U.S. Dept. Agric.) 475 Mr. [J. W.] Gregory became convinced of the existence at moderate depths below the surface..of an almost continuous drainage supply, which he has termed the under-sheet or under-flow water.

1905 U.S. Geol. Surv. Water-Supply & Irrigation Papers No. 140. 85 Such wells, several hundred feet in depth, with perforations opposite the best water-bearing material, would utilize a large part of the underflow which now escapes to the sea.

1951 H. E. Thomas Conservation of Ground Water iii. 138 Underflow is the only method of movement in certain reaches of some streams, where the surface channel is dry.

1970 W. C. Walton Groundwater Resource Evaluation vi. 375 Water leaving basins includes streamflow, evapo-transpiration, and subsurface underflow.

3. Computing. [After overflow n. 5c.] The generation of a number that is too small to be represented in the device meant to store it.

ΘΚΠ

society > computing and information technology > [noun] > results of numerical operations

overflow1950

underflow1959

1959 E. M. McCormick Digital Computer Primer xi. 155 A number which is too small (yet is not 0) will cause an ‘underflow’.

1970 O. Dopping Computers & Data Processing vi. 102 In machines with automatic floating-point arithmetic..there may also be indicators for overflow and underflow in the characteristic.

1985 Personal Computer World Feb. 182/2 Computer users pay far less attention to underflow than they do to overflow or rounding.

This entry has not yet been fully updated (first published 1921; most recently modified version published online March 2022).

underflowv.

Brit.

/ˌʌndəˈfləʊ/, U.S.

/ˌəndərˈfloʊ/

Etymology: under- prefix¹ 2a(a), 2a(b) Compare Old English underflówan.

1. intransitive. To flow beneath.

ΘΚΠ

the world > the earth > water > flow or flowing > flow [verb (intransitive)] > flow under

underflow1610

1610 P. Holland tr. W. Camden Brit. ii. 45 It looketh downe to the vnderflowing sea.

1647 H. Hexham Copious Eng. & Netherduytch Dict. To Vnderflow, onder-vloeyen.

2. transitive. To flow in under (something).

ΘΚΠ

the world > the earth > water > flow or flowing > cause to flow [verb (transitive)] > under

underwash1538

underflow1872

1872 W. H. Dixon Switzers v. 45 The waters..underflowed the beams, and lifted the strong habitations.

3. intransitive. Computing. Usually ˈunderflow. [Compare underflow n. 3] Of the result of an arithmetical operation: to become too small for the device meant to store it.

ΘΚΠ

society > computing and information technology > [verb (intransitive)] > produce underflow

underflow1965

1965 IBM Systems Jrnl. 4 32 If the exponent underflows or the result fraction is zero, the result should be treated as ‘zero’.

1973 C. W. Gear Introd. Computer Sci. ii. 73 Give examples of pairs of numbers A and B in internal form such that..A × B underflows in floating~point arithmetic.

This entry has not yet been fully updated (first published 1921; most recently modified version published online March 2022).

单词	underflow
释义	underflown. Brit. /ˈʌndəfləʊ/, U.S. /ˈəndərˌfloʊ/ Etymology: under- prefix¹ 2b(c). 1. An undercurrent. Also figurative. ΘΚΠ the mind > mental capacity > knowledge > hiding, concealing from view > [noun] > hidden tendency or activity under-water1618 undercurrent1792 undertow1817 underplay1845 underswell1849 nigger in the fence1850 nigger in the woodpile1852 underflow1854 —— in the woodpile1857 undernote1857 undertone1861 underdrift1891 under-belly1962 the world > the earth > water > flow or flowing > current > [noun] > under-current underwork1610 underflood?1615 undercurrent1684 underset1815 undertow1817 subcurrent1822 underdrift1849 under-draught1853 underflow1854 under-water1859 undercarry1894 underrun1894 turbidity current1939 1854 S. T. Dobell Balder xxiv. 169 That underflow and subterrene Wherein the future heaves. 1875 J. Croll Climate & Time viii. 133 An underflow of polar water south into the Atlantic. 2. The (more or less horizontal) flow of water through the ground, spec. underneath a river bed. ΘΚΠ the world > the earth > water > flow or flowing > [noun] > flowing under ground undercreeping1398 underflow1890 1890 Rep. Secretary of Agric. 1890 (U.S. Dept. Agric.) 472 Papers on underflow and subterranean water. 1890 Rep. Secretary of Agric. 1890 (U.S. Dept. Agric.) 475 Mr. [J. W.] Gregory became convinced of the existence at moderate depths below the surface..of an almost continuous drainage supply, which he has termed the under-sheet or under-flow water. 1905 U.S. Geol. Surv. Water-Supply & Irrigation Papers No. 140. 85 Such wells, several hundred feet in depth, with perforations opposite the best water-bearing material, would utilize a large part of the underflow which now escapes to the sea. 1951 H. E. Thomas Conservation of Ground Water iii. 138 Underflow is the only method of movement in certain reaches of some streams, where the surface channel is dry. 1970 W. C. Walton Groundwater Resource Evaluation vi. 375 Water leaving basins includes streamflow, evapo-transpiration, and subsurface underflow. 3. Computing. [After overflow n. 5c.] The generation of a number that is too small to be represented in the device meant to store it. ΘΚΠ society > computing and information technology > [noun] > results of numerical operations overflow1950 underflow1959 1959 E. M. McCormick Digital Computer Primer xi. 155 A number which is too small (yet is not 0) will cause an ‘underflow’. 1970 O. Dopping Computers & Data Processing vi. 102 In machines with automatic floating-point arithmetic..there may also be indicators for overflow and underflow in the characteristic. 1985 Personal Computer World Feb. 182/2 Computer users pay far less attention to underflow than they do to overflow or rounding. This entry has not yet been fully updated (first published 1921; most recently modified version published online March 2022). underflowv. Brit. /ˌʌndəˈfləʊ/, U.S. /ˌəndərˈfloʊ/ Etymology: under- prefix¹ 2a(a), 2a(b) Compare Old English underflówan. 1. intransitive. To flow beneath. ΘΚΠ the world > the earth > water > flow or flowing > flow [verb (intransitive)] > flow under underflow1610 1610 P. Holland tr. W. Camden Brit. ii. 45 It looketh downe to the vnderflowing sea. 1647 H. Hexham Copious Eng. & Netherduytch Dict. To Vnderflow, onder-vloeyen. 2. transitive. To flow in under (something). ΘΚΠ the world > the earth > water > flow or flowing > cause to flow [verb (transitive)] > under underwash1538 underflow1872 1872 W. H. Dixon Switzers v. 45 The waters..underflowed the beams, and lifted the strong habitations. 3. intransitive. Computing. Usually ˈunderflow. [Compare underflow n. 3] Of the result of an arithmetical operation: to become too small for the device meant to store it. ΘΚΠ society > computing and information technology > [verb (intransitive)] > produce underflow underflow1965 1965 IBM Systems Jrnl. 4 32 If the exponent underflows or the result fraction is zero, the result should be treated as ‘zero’. 1973 C. W. Gear Introd. Computer Sci. ii. 73 Give examples of pairs of numbers A and B in internal form such that..A × B underflows in floating~point arithmetic. This entry has not yet been fully updated (first published 1921; most recently modified version published online March 2022). < n.1854v.1610
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