steam up

动词

To become steamy.
To become coated with condensation. · The bathroom mirror steamed up when he opened the shower door.
To bring (a steam boiler) up to working steam pressure: to build up a head of steam inside (a boiler). (transitive) · It takes about an hour to steam up the locomotive.
to build up a head of steam. (intransitive) · Engine 99 had been steaming up since 21:00.
To cook by steaming. (transitive) · I'll steam up a bunch of dumplings.

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