jump-offn.

Brit.

/ˈdʒʌmpˌɒf/, U.S.

/ˈdʒəmpˌɔf/,

/ˈdʒəmpˌɑf/

Etymology: < to jump off.

a. A precipitous descent; a place from which a person must jump. U.S. colloquial.

ΘΚΠ

the world > the earth > land > landscape > high land > slope > [noun] > steep

cliffOE

cleevec1300

hangingc1400

braea1500

steep1555

steepness1585

proclivity1645

upright1712

sliddera1793

snab1797

scarp1802

escarpment1815

shin1817

escarp1856

hag1868

jump-off1873

inface1896

fault-scarp1897

scarping1909

fault-line scarp1911

steephead1918

jump-up1927

1873 J. H. Beadle Undeveloped West xxiv. 491 In this [bayou] we encountered dangerous whirls and jump-offs, the wagon often plunging in up to the bed.

1884 C. Phillipps-Wolley Trottings of Tenderfoot v. 129 The broad stem of a fallen giant gives you 150 feet of splendid wooden road; but..you find you have been gradually ascending, and now stand on what the Americans would call a ‘jump off’.

1909 R. A. Wason Happy Hawkins ii. 26 The lantern shed a splash o' light on the shelf, but the jump-off looked like the mouth o' the pit.

b. The start of a military operation or campaign. U.S. slang.

ΘΚΠ

society > armed hostility > military operations > [noun] > start of

hour of zero1915

zero hour1915

jump-off1918

1918 in Amer. Speech (1944) 19 302 ‘Over the top’ is now ‘the jump off’ and ‘zero hour’ has changed to ‘H hour’.

1944 Daily Progress (Charlottesville, Va.) 12 May 1/8 The Fifth and Eighth armies have launched the greatest drive in Mediterranean warfare in the jump-off of Allied spring offensives.

1945 Sun (Baltimore) 23 Feb. 1/6 (heading) Canadians find going toughest since jumpoff.

2. Aeronautics. A vertical take-off.In quot. 1969 ‘jump off point’ = jumping-off point n. at jumping n. Compounds.

ΘΚΠ

society > travel > air or space travel > action of flying (in) aircraft > specific flying operations or procedures > [noun] > take-off > types of

jump-off1939

jato1944

RATO1945

lift-off1956

1939 Jrnl. Royal Aeronaut. Soc. 43 110 (heading) Possibilities of the jump-off autogyro.

1939 Jrnl. Royal Aeronaut. Soc. 43 110 The available kinetic energy in the rotor system for ‘jump-off’ is directly proportional to the weight of the blades and to the square of the rotational speed of the rotor.

1969 Daily Tel. 16 Jan. 1/6 A space station in permanent orbit round the earth..could..be used as a ‘jump off’ point for travel to the moon.

3. Show-jumping. An additional round to resolve or determine a tie.

ΘΚΠ

society > leisure > sport > types of sport or game > equestrian sports except racing > [noun] > show-jumping > final round

jump-off1947

barrage1955

tie-off1958

1947 H. Disston Equestionnaire (rev. ed.) 77 In the event of a jump off over triple bars, how is the obstacle altered?

1954 P. Smythe Jump for Joy vii. 113 The final jump-off included a high wall with a pole on top.

1969 Times 10 May 6/5 Alan Oliver..justified..the odds laid on him in the..competition yesterday. Riding Pitz Palu, who was made favourite at 7-2 and shortened to 2-1 for the jumpoff, he..made the running from start to finish.

This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2022).

单词	jump-off
释义	jump-offn. Brit. /ˈdʒʌmpˌɒf/, U.S. /ˈdʒəmpˌɔf/, /ˈdʒəmpˌɑf/ Etymology: < to jump off. 1. a. A precipitous descent; a place from which a person must jump. U.S. colloquial. ΘΚΠ the world > the earth > land > landscape > high land > slope > [noun] > steep cliffOE cleevec1300 hangingc1400 braea1500 steep1555 steepness1585 proclivity1645 upright1712 sliddera1793 snab1797 scarp1802 escarpment1815 shin1817 escarp1856 hag1868 jump-off1873 inface1896 fault-scarp1897 scarping1909 fault-line scarp1911 steephead1918 jump-up1927 1873 J. H. Beadle Undeveloped West xxiv. 491 In this [bayou] we encountered dangerous whirls and jump-offs, the wagon often plunging in up to the bed. 1884 C. Phillipps-Wolley Trottings of Tenderfoot v. 129 The broad stem of a fallen giant gives you 150 feet of splendid wooden road; but..you find you have been gradually ascending, and now stand on what the Americans would call a ‘jump off’. 1909 R. A. Wason Happy Hawkins ii. 26 The lantern shed a splash o' light on the shelf, but the jump-off looked like the mouth o' the pit. b. The start of a military operation or campaign. U.S. slang. ΘΚΠ society > armed hostility > military operations > [noun] > start of hour of zero1915 zero hour1915 jump-off1918 1918 in Amer. Speech (1944) 19 302 ‘Over the top’ is now ‘the jump off’ and ‘zero hour’ has changed to ‘H hour’. 1944 Daily Progress (Charlottesville, Va.) 12 May 1/8 The Fifth and Eighth armies have launched the greatest drive in Mediterranean warfare in the jump-off of Allied spring offensives. 1945 Sun (Baltimore) 23 Feb. 1/6 (heading) Canadians find going toughest since jumpoff. 2. Aeronautics. A vertical take-off.In quot. 1969 ‘jump off point’ = jumping-off point n. at jumping n. Compounds. ΘΚΠ society > travel > air or space travel > action of flying (in) aircraft > specific flying operations or procedures > [noun] > take-off > types of jump-off1939 jato1944 RATO1945 lift-off1956 1939 Jrnl. Royal Aeronaut. Soc. 43 110 (heading) Possibilities of the jump-off autogyro. 1939 Jrnl. Royal Aeronaut. Soc. 43 110 The available kinetic energy in the rotor system for ‘jump-off’ is directly proportional to the weight of the blades and to the square of the rotational speed of the rotor. 1969 Daily Tel. 16 Jan. 1/6 A space station in permanent orbit round the earth..could..be used as a ‘jump off’ point for travel to the moon. 3. Show-jumping. An additional round to resolve or determine a tie. ΘΚΠ society > leisure > sport > types of sport or game > equestrian sports except racing > [noun] > show-jumping > final round jump-off1947 barrage1955 tie-off1958 1947 H. Disston Equestionnaire (rev. ed.) 77 In the event of a jump off over triple bars, how is the obstacle altered? 1954 P. Smythe Jump for Joy vii. 113 The final jump-off included a high wall with a pole on top. 1969 Times 10 May 6/5 Alan Oliver..justified..the odds laid on him in the..competition yesterday. Riding Pitz Palu, who was made favourite at 7-2 and shortened to 2-1 for the jumpoff, he..made the running from start to finish. This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2022). < n.1873
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