overdeepenv.

Brit.

/ˌəʊvəˈdiːp(ə)n/, U.S.

/ˌoʊvərˈdip(ə)n/

Origin: Formed within English, by derivation. Etymons: over- prefix, deepen v.

Etymology: < over- prefix + deepen v., probably after overdeepening n. Compare overdeepened adj.

Chiefly Physical Geography.

1. transitive. To erode (a valley) more deeply by glacial action than would occur by water erosion alone.

ΚΠ

1901 Science 1 Mar. 351/2 The depth to which certain valleys..have been eroded is taken to prove that the region stood about 1,000 feet higher than now in preglacial time; the capacity of glaciers to over-deepen their valleys not being accepted.

1970 C. A. Lewis Glaciations Wales ii. 25 The major through-valleys of Snowdonia were overdeepened and straightened at this time by lowering of the watersheds by ice moving radially outwards from a centre near Llyn Tegid.

1990 A. S. Trenhaile Geomorphol. Canada iii. 43 Valleys that have been overdeepened and oversteepened by stream and glacial erosion.

2. transitive. More generally: to deepen excessively or abnormally; esp. to further deepen by erosion.

ΘΚΠ

the world > the earth > structure of the earth > formation of features > tectonization or diastrophism > tectonize [verb (transitive)] > subsidence or troughing

trough1839

overdeepen1905

the world > the earth > structure of the earth > formation of features > erosion or weathering > erode [verb (transitive)] > erosion of specific features

peneplain1896

overdeepen1905

planate1906

lateritize1909

karstify1972

1905 Jrnl. Geol. (Chicago) 13 392 As soon as a shallow wind-blown hollow is formed, that part of the integrated drainage system which leads to the hollow will supply waste to it whenever rain falls there;..the coarser waste will accumulate, and thus the tendency of the winds to overdeepen local hollows will be..counteracted.

1976 Philos. Trans. (Royal Soc.) A. 283 449 In these areas rapid downcutting would overdeepen the Upper Lias slopes.

This entry has been updated (OED Third Edition, December 2004; most recently modified version published online March 2022).

单词	overdeepen
释义	overdeepenv. Brit. /ˌəʊvəˈdiːp(ə)n/, U.S. /ˌoʊvərˈdip(ə)n/ Origin: Formed within English, by derivation. Etymons: over- prefix, deepen v. Etymology: < over- prefix + deepen v., probably after overdeepening n. Compare overdeepened adj. Chiefly Physical Geography. 1. transitive. To erode (a valley) more deeply by glacial action than would occur by water erosion alone. ΚΠ 1901 Science 1 Mar. 351/2 The depth to which certain valleys..have been eroded is taken to prove that the region stood about 1,000 feet higher than now in preglacial time; the capacity of glaciers to over-deepen their valleys not being accepted. 1970 C. A. Lewis Glaciations Wales ii. 25 The major through-valleys of Snowdonia were overdeepened and straightened at this time by lowering of the watersheds by ice moving radially outwards from a centre near Llyn Tegid. 1990 A. S. Trenhaile Geomorphol. Canada iii. 43 Valleys that have been overdeepened and oversteepened by stream and glacial erosion. 2. transitive. More generally: to deepen excessively or abnormally; esp. to further deepen by erosion. ΘΚΠ the world > the earth > structure of the earth > formation of features > tectonization or diastrophism > tectonize [verb (transitive)] > subsidence or troughing trough1839 overdeepen1905 the world > the earth > structure of the earth > formation of features > erosion or weathering > erode [verb (transitive)] > erosion of specific features peneplain1896 overdeepen1905 planate1906 lateritize1909 karstify1972 1905 Jrnl. Geol. (Chicago) 13 392 As soon as a shallow wind-blown hollow is formed, that part of the integrated drainage system which leads to the hollow will supply waste to it whenever rain falls there;..the coarser waste will accumulate, and thus the tendency of the winds to overdeepen local hollows will be..counteracted. 1976 Philos. Trans. (Royal Soc.) A. 283 449 In these areas rapid downcutting would overdeepen the Upper Lias slopes. This entry has been updated (OED Third Edition, December 2004; most recently modified version published online March 2022). < v.1901
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