duckyoudaoicibaDictYouDict[duck 词源字典]
duck: [OE] A duck is a bird that ‘ducks’ – as simple as that. It gets its name from its habit of diving down under the surface of the water. There is no actual record of an English verb duck until the 14th century, but it is generally assumed that an Old English verb *dūcan did exist, which would have formed the basis of the noun duck. It came from a prehistoric West Germanic verb *dukjan, which also produced German tauchen ‘dive’.

English is the only language which uses this word for the bird, although Swedish has the term dykand, literally ‘dive-duck’, which refers to the ‘diver’, a sort of large waterbird. Nor is it the original English word: the Anglo-Saxons mainly called the duck ened, a term which survived until the 15th century. This represents the main Indo-European name for the duck, which comes from an original *anə ti- and is found in Greek nessa, Latin anas, German ente, Dutch eend, Swedish and, and Russian utka.
[duck etymology, duck origin, 英语词源]
duck (n.1)youdaoicibaDictYouDict
waterfowl, Old English duce (found only in genitive ducan) "a duck," literally "a ducker," presumed to be from Old English *ducan "to duck, dive" (see duck (v.)). Replaced Old English ened as the name for the bird, this being from PIE *aneti-, the root of the "duck" noun in most Indo-European languages.
In the domestic state the females greatly exceed in number, hence duck serves at once as the name of the female and of the race, drake being a specific term of sex. [OED]
As a term of endearment, attested from 1580s. duck-walk is 1930s; duck soup "anything easily done" is by 1899. Duck's ass haircut is from 1951. Ducks-and-drakes, skipping flat stones on water, is from 1580s; the figurative sense of "throwing something away recklessly" is c. 1600.
duck (n.2)youdaoicibaDictYouDict
"strong, untwilled linen (later cotton) fabric," used for sails and sailors' clothing, 1630s, from Dutch doeck "linen cloth" (Middle Dutch doec), related to German Tuch "piece of cloth," Danish dug, Old Frisian dok, Old High German tuoh, all of unknown origin.
duck (v.)youdaoicibaDictYouDict
"to plunge into" (transitive), c. 1300; to suddenly go under water (intransitive), mid-14c., from presumed Old English *ducan "to duck," found only in derivative duce (n.) "duck" (but there are cognate words in other Germanic languages, such as Old High German tuhhan "to dip," German tauchen "to dive," Old Frisian duka, Middle Dutch duken "to dip, dive," Dutch duiken), from Proto-Germanic *dukjan.

Sense of "bend, stoop quickly" is first recorded in English 1520s. Related: Ducked; ducking. The noun is attested from 1550s in the sense of "quick stoop;" meaning "a plunge, dip" is from 1843.