To Drain

1. (intransitive) To lose liquid.
2. (intransitive) To flow gradually.
3. (transitive, ergative) To cause liquid to flow out of.
4. (transitive, ergative) To convert a perennially wet place into a dry one.
5. (transitive) To deplete of energy or resources.
6. (transitive) To draw off by degrees; to cause to flow gradually out or off; hence, to exhaust.
7. (transitive, obsolete) To filter.
8. (intransitive, pinball) To fall off the bottom of the playfield.