downcuttingn.

Brit.

/ˈdaʊnˌkʌtɪŋ/, U.S.

/ˈdaʊnˌkədɪŋ/

Origin: Formed within English, by derivation. Etymons: down- prefix, cutting n.

Etymology: < down- prefix + cutting n. Compare later downcut v.

Geology.

A process of erosion, esp. by flowing water, in which a stream bed, valley floor, etc., is lowered by removal of overlying material; downward erosion.

ΚΠ

1873 Q. Jrnl. Geol. Soc. 29 458 In parts where the valley is narrowed there may be no remains of the old alluvium, all having been denuded on the last down-cutting of the river-bed.

1952 J. A. Steers et al. Lake's Physical Geogr. (ed. 3) iii. x. 356 A thin one [sc. glacier]..may do relatively little down-cutting but a fair amount of valley widening by freeze-thaw and removal.

1984 J. J. Lowe & M. J. C. Walker Reconstructing Quaternary Environments ii. 67 Terraces..may represent the upper level of aggradation before subsequent downcutting i.e. the surfaces of former floodplains.

2015 Arctic 68 465/1 Apart from downcutting of the tidal flats, erosional retreat of the coast is not a serious concern in Iqaluit.

This entry has been updated (OED Third Edition, December 2018; most recently modified version published online March 2022).

单词	downcutting
释义	downcuttingn. Brit. /ˈdaʊnˌkʌtɪŋ/, U.S. /ˈdaʊnˌkədɪŋ/ Origin: Formed within English, by derivation. Etymons: down- prefix, cutting n. Etymology: < down- prefix + cutting n. Compare later downcut v. Geology. A process of erosion, esp. by flowing water, in which a stream bed, valley floor, etc., is lowered by removal of overlying material; downward erosion. ΚΠ 1873 Q. Jrnl. Geol. Soc. 29 458 In parts where the valley is narrowed there may be no remains of the old alluvium, all having been denuded on the last down-cutting of the river-bed. 1952 J. A. Steers et al. Lake's Physical Geogr. (ed. 3) iii. x. 356 A thin one [sc. glacier]..may do relatively little down-cutting but a fair amount of valley widening by freeze-thaw and removal. 1984 J. J. Lowe & M. J. C. Walker Reconstructing Quaternary Environments ii. 67 Terraces..may represent the upper level of aggradation before subsequent downcutting i.e. the surfaces of former floodplains. 2015 Arctic 68 465/1 Apart from downcutting of the tidal flats, erosional retreat of the coast is not a serious concern in Iqaluit. This entry has been updated (OED Third Edition, December 2018; most recently modified version published online March 2022). < n.1873
随便看	action word action, writ of ejectment action-packed action-taking actionability actionable actionably actional actionary actioned actioner actioners actioning actionism actionist actionize actionless actionpacked actions actions speak louder than words actiontaking actious actitation activable activase