Definitions
(military) signal to turn the lights out
Word origin
From tap (noun) + -s. Noun 1 sense 1 (“signal for extinguishing all lights in soldiers’ quarters and retiring to bed”) is from the fact that the signal was originally made using a drum.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Gentle knocks”4 letters
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