Ack

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Safin讨论 | 贡献2022年4月28日 (四) 23:31的版本 (建立内容为“Category:etymology == wiktionary == [https://en.wiktionary.org/wiki/ack ref] Clipping of acknowledged. Imitative. == etymonline == [https://www.etymon…”的新页面)
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wiktionary

ref

Clipping of  acknowledged. 

Imitative.


etymonline

ref

ack

British oral code for letter -a- in wireless and telephone communication, 1898; hence ack-ack "anti-aircraft" (gun, fire, etc.). Compare toc (-t-), emma (-m-).