Steam up

The bathroom mirror steamed up when he opened the shower door.

The large plateglass window, from which I had an excellent view of the countryside the following day, was prevented from steaming up by a de-misting device.

It takes about an hour to steam up the locomotive.

Engine 99 had been steaming up since 21:00.

"The master of the Nan-Shan [...] desired Mr. Rout to have steam up to-morrow afternoon at one o'clock sharp."

I'll steam up a bunch of dumplings.