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Phrase(s): drain away
[for something] to flow away. • All the water drained away and exposed the mud and rocks on the bottom of the pond. • When the water drained away, we found three snapping turtles in the bottom of the pond., Phrase(s): drain something away (from something)
to channel some liquid away from something. • Drain all of the standing water away from the foundation of the house. • Drain away the water from the foundation.
McGrawhill's American Idioms And Phrasal Verbs