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D.A.
[D.A. 词源字典]
American English initialism (acronym) for
district attorney
from 1934; for
duck's ass
haircut (or, as OED would have it,
duck's arse
), from 1951. The haircut so called for the shape at the back of the head.
[D.A. etymology, D.A. origin, 英语词源]