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general::
Phrase(s): steam out (of some place)
[for a conveyance, usually a ship] to exit something under power. (Originally referred to steam engines, but now can be any sort of engine.) • The huge diesel engines began to labor, and the ship steamed out of its berth. • It shuddered a couple of times and steamed out.
McGrawhill's American Idioms And Phrasal Verbs