steam up

动词verb

1. 1To become steamy.
2. 2To become coated with condensation.
3. 3transitiveTo bring (a steam boiler) up to working steam pressure: to build up a head of steam inside (a boiler).
4. 4intransitiveto build up a head of steam.
5. 5transitiveTo cook by steaming.
6. 6(agriculture) This term needs a definition. Please help out and add a definition, then remove the text {{rfdef}}.