From The Collaborative International Dictionary of English v.0.48 [gcide]:
Tap \Tap\, n. [AS. t[ae]ppa, akin to D. tap, G. zapfen, OHG.
zapfo, Dan. tap, Sw. tapp, Icel. tappi. Cf. {Tampion},
{Tip}.]
1. A hole or pipe through which liquor is drawn.
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2. A plug or spile for stopping a hole pierced in a cask, or
the like; a faucet.
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3. Liquor drawn through a tap; hence, a certain kind or
quality of liquor; as, a liquor of the same tap. [Colloq.]
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4. A place where liquor is drawn for drinking; a taproom; a
bar. [Colloq.]
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5. (Mech.) A tool for forming an internal screw, as in a nut,
consisting of a hardened steel male screw grooved
longitudinally so as to have cutting edges.
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{On tap}.
(a) Ready to be drawn; as, ale on tap.
(b) Broached, or furnished with a tap; as, a barrel on
tap.
{Plug tap} (Mech.), a screw-cutting tap with a slightly
tapering end.
{Tap bolt}, a bolt with a head on one end and a thread on the
other end, to be screwed into some fixed part, instead of
passing through the part and receiving a nut. See Illust.
under {Bolt}.
{Tap cinder} (Metal.), the slag of a puddling furnace.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
on tap
adj 1: (of liquids) available by turning a tap; "ale on tap";
"hot and cold running water on tap"
2: available for immediate use; "extra personnel on tap"; "other
sports and entertainment facilities are on tap"; "there are
numerous projects on tap"
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