O.E.
duce (found only in gen.
ducan) "a duck," lit. "a ducker," presumed to be from O.E.
*ducan "to duck" (see
duck (v.)), replaced O.E.
ened as the name for the bird, this being from PIE
*aneti-, the root of the "duck" noun in most I.E. languages. As a term of endearment, attested from 1590.
duck-walk is 1930s;
duck soup "anything easily done" is from 1908.
Lame duck, originally Stock Exchange slang for "defaulter," is first attested 1761.
Duck's ass haircut is from 1951.
Ducks-and-drakes, skipping flat stones on water, is from 1583; the fig. sense of "throwing something away recklessly" is c.1600. The
ugly ducking is from Hans Andersen's tale.