dryyoudaoicibaDictYouDict[dry 词源字典]
dry: [OE] Dry comes ultimately from prehistoric Germanic *draugiz, a derivative of the base *draug-, *drūg-, which also produced English drought and drain. Its other Germanic relatives are Dutch droog and German trocken, and some have connected it with Old Norse drjūgr ‘lasting, strong’, Old Prussian drūktai ‘firmly’, and Lithuanian dialect drūktas ‘thick, strong’ – the theory being that strength and endurance are linked with ‘drying out’.
=> drain, drought[dry etymology, dry origin, 英语词源]
dry (adj.)youdaoicibaDictYouDict
Old English dryge, from Proto-Germanic *draugiz (cognates: Middle Low German dröge, Middle Dutch druge, Dutch droog, Old High German trucchon, German trocken, Old Norse draugr), from Germanic root *dreug- "dry."

Meaning "barren" is mid-14c. Of humor or jests, early 15c. (implied in dryly); as "uninteresting, tedious" from 1620s. Of places prohibiting alcoholic drink, 1870 (but dry feast, one at which no liquor is served, is from late 15c.; colloquial dry (n.) "prohibitionist" is 1888, American English). Dry goods (1708) were those measured out in dry, not liquid, measure. Dry land (that not under the sea) is from early 13c. Dry run is from 1940s.
dry (v.)youdaoicibaDictYouDict
Old English drygan, related to dry (adj.). Related: Dried; drying. Of the two agent noun spellings, drier is the older (1520s), while dryer (1874) was first used of machines. Dry out in the drug addiction sense is from 1967. Dry up "stop talking" is 1853.