drain out

drain out (third-person singular simple present drains out, present participle draining out, simple past and past participle drained out)

1. (transitive) To empty (something) completely of liquids; to drain completely.
   • 1962 October, M. J. Wilson, “Three years of dieselisation at Devons Road depot”, in Modern Railways, page 264:

     Anti-freeze has not been found necessary, even in the most severe conditions, since the water is drained out if a locomotive spends any appreciable time out of service and in normal working conditions the coolant is always warm.

2. (intransitive) To be emptied of liquid; to be drained completely.

• duration