on tap—
1. (of beer, etc.) drawn from a cask:
- The high-density drink is Geuze (so called when it is bottled, and Lambic when it is on tap).
2. (coll.) available for immediate use:
- I don’t believe in investing every penny one has; I like to have a few hundred pounds on tap.
3. (coll.) said of smth. scheduled to happen very soon:
- More military and medical experiments are on tap for Atlantis astronauts today.
on the tap—(sl.) begging for money, etc.; asking for a loan:
- She was a real moaner and always on the tap, borrowing sugar and milk.