Tap (copy and paste from http://www.answers.com/topic/tap): tr.v., tapped, tap·ping, taps. 1.To furnish with a spigot or tap. 2.To pierce in order to draw off liquid: tap a maple tree. 3.To draw (liquid) from a vessel or container: tap a new keg of beer. 4.Medicine. To withdraw fluid from (a body cavity). 5.To make a physical connection with or open outlets from: tap a water main. 6. a.To wiretap (a telephone). b.To establish an electric connection in (a power line), as to divert current secretly. 7.To establish access to or a connection with: tapped a new market for inexpensive books. 8.To take advantage of; make use of: tapped voter anger to win the election. 9.To cut screw threads in (a collar, socket, or other fitting). 10.Informal. To ask (a person) for money.