TAP

(DEVICE), US faucet [noun] [C] - a device which controls the flow of liquid, esp. water (US faucet), or gasbath tapsthe hot/cold tapa gas tapCould you turn the tap on/off, please.From the bathroom I could hear the sound of a dripping tap.See pictures: Bathroom, LaboratoryBeer which is on tap is served from a barrel through a tap.The local pub has over twenty different beers on tap.(figurative) Working in a library as I do, I have all this information on tap (= available to be used at any time).Tap water is the water which comes out of the taps in a building, which are usually connected to the main supply of the local water system.