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Phrase(s): wash someone or something overboard
[for water] to flood up and carry someone or something off the deck of a ship into the sea. • The high seas washed two of the sailors overboard. • The storm washed our chairs overboard., Phrase(s): wash overboard
[for someone or something] to be carried overboard (off the deck of a ship) by water. • Our chairs washed overboard in the storm. • I was afraid that the dog would wash overboard, so I took her below.
McGrawhill's American Idioms And Phrasal Verbs