Tapped

To furnish with taps.

"If we tap the maple trees, we can get maple syrup!"

To draw off liquid from a vessel.

"He tapped a new barrel of beer."

To deplete, especially of a liquid via a tap; to tap out.

To exploit.

"Businesses are trying to tap the youth market."

To strike lightly.

"She tapped him on the shoulder to get his attention."

To touch one's finger, foot, or other body parts on a surface (usually) repeatedly.

"He was so nervous he began to tap his fingers on the table."

To make a sharp noise.

"The tree, swaying in the breeze, began to tap on the window pane."

To operate an electronic device (e.g. a mobile phone) by tapping a specific place on its (capacitive or other) touch screen.

Furnished with active taps (e.g. a keg or a maple tree)

Of a card or playing piece, used up for the current turn