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1939, in the meaning defined above
from asdics underwater echo ranging, probably from Anti-Submarine Division (British Admiralty department 1916–18) + -ics
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Resources for asdic
(as) dead as a dodo
(as) dead as a doornail
as deaf as a post
as distinct from
as distinguished from
(as) drunk as a lord
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It relates to godfathers.
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