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The noun is derived from Middle English tappe (“hollow device for controlling the flow of liquid from a hole, cock, faucet, spigot; hole through which the liquid flows; the liquid which thus flows”), from Old English tæppa, from Proto-West Germanic *tappō, from Proto-Germanic *tappô (“a plug, tap; peg; tapering stick”), from Proto-Indo-European *deh₂p- (“to lose; to sacrifice”). Doublet of tapa. The verb is derived from Middle English tappen (“to obtain (liquid, chiefly liquor) from a tap; to obtain and sell (liquor)”), from Old English tæppian (“to provide (a container) with a stopper; to obtain (liquid) from a tap”), and then either: * from Old English tæppa (see above) + -ian (suffix forming verbs); or * from Proto-Germanic *tappōną, from *tappô (noun) (see above). Verb etymology 1, verb sense 1.3.5 (“to turn over (a playing card or playing piece) to remind players that it has already been used in that round”) alludes to the abilities or resources of the card or piece having been drawn on to the point of temporary exhaustion: see verb etymology 1, verb sense 1.3.2.

The verb is derived from Middle English tappen, teppen (“to give (something) a knock or tap; to hit (something) lightly, pat, tap”), either: * imitative of the making of a tapping sound; or * from Old French tapper, taper (“to tap”) (modern French taper), from Frankish *tappōn, *dabbōn (“to strike”), or from Middle Low German tappen, tapen (“to rap, strike, tap”), or from Proto-Germanic *tabōną (“to grope, to grapple, to claw”), maybe via a Old Norse *tapa (“to strike”), as seen in the derivative tapsa (“to tap”) Doublet of dab and tave. Verb etymology 2, verb sense 1.1.1 (“to arrest (someone)”) and etymology 2, verb sense 1.6 (“to choose or designate (someone) for a duty, etc.”) allude to a police officer or other person tapping someone on their shoulder to catch their attention or to select them. The noun is derived from Middle English tap, tappe (“light blow or hit”), and then either: * from Middle English tappen (verb) (see above); or * from Old French tape (“light slap or touch, pat”) (modern French tape), from tapper, taper (verb) (see above). Cognates * German tappen (“to fumble; to grope”) * Icelandic tappa, tapsa, tæpta (“to tap”)

From Persian or Urdu تب (tab, “malarial fever”), ultimately from Sanskrit ताप (tāpa, “fever; heat; pain, torment”).