Etymology
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Words related to tap

spigot (n.)
late 14c., "plug used to stop the hole of a cask," according to Barnhart probably from Old French *espigot (compare Gascony dialect espigot "core of a fruit, small ear of grain"), diminutive of Old Provençal espiga "ear of grain," from Latin spica "ear of grain" (see spike (n.2)). Meaning "valve for controlling the flow of a liquid" is from 1520s; the connecting notion is "that which controls or restrains."
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tampion (n.)

early 15c., "plug, bung," from a nasalized variant of Old French tapon "piece of cloth to stop a hole" (14c.), a suffixed form of Frankish *tappo "stopper, plug," related to Old High German zapfo and Old English tæppa "stopper" (see tap (n.1)). Meaning "wooden plug for the muzzle of a gun" (to keep out rain or seawater) is recorded from 1620s.

taphouse (n.)
also tap-house, c. 1500, from tap (n.1) + house (n.).
taproom (n.)
also tap-room, 1807, from tap (n.1) + room (n.).
tapster (n.)
"person employed to tap liquors," Old English tæppestre "female tavern-keeper, hostess at an inn, woman employed to tap liquors," fem of tæppere, from tæppa "tap" (see tap (n.1)) + fem. ending -ster. The distinction of gender in the word was lost by 15c., and by 1630s re-feminized tapstress is attested.
tattoo (n.1)
"signal calling soldiers or sailors to quarters at night," 1680s, earlier tap-to (1640s), from Dutch taptoe, from tap "faucet of a cask" (see tap (n.1)) + toe "shut, to," from Proto-Germanic *to (see to (prep.)). "So called because police formerly visited taverns in the evening to shut off the taps of casks" [Barnhart]. In 17c. Dutch the phrase apparently was used with a transferred or figurative sense "say no more." In English, transferred sense of "drumbeat" is recorded from 1755. Hence, Devil's tattoo "action of idly drumming fingers in irritation or impatience" (1803).
love-tap (n.)
"gentle blow given affectionately," 1848, from love (n.) + tap (n.2).
wire-tapping (n.)
also wiretapping, "surreptitiously obtaining information by connecting wires to telegraph (later telephone) lines and establishing an intermediate station between two legitimate ones," 1878, from wire (n.) + agent noun from tap (v.2). Earliest references often are to activity during the American Civil War, but the phrase does not seem to have been used at that time. Related: Wire-tap; wire-tapper.
tappet (n.)
machine part, 1745, apparently from tap (v.1) + -et, "but the use of the suffix is abnormal" [OED].
taproot (n.)
c. 1600, from tap (n.) + root (n.).