from asdics underwater echo ranging, probably from Anti-Submarine Division (British Admiralty department 1916–18) + -ics
1939, in the meaning defined above
as deaf as a post
asdic
as distinct from
“Asdic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/asdic. Accessed 5 Oct. 2024.
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