boil off

1. (transitive)To remove by boiling

   Cooking it will boil off the vodka.

2. (intransitive)To be removed by boiling

   Some of the salt will rise up with the vapors, but most of it will be left in the pan when the water has boiled off.

irregular

• boil downзводитися, звестисяTo reduce in volume by boiling.
• boil upTo cook or prepare by boiling.
• boil offTo remove by boiling
• boil overTo boil to such an extent as to overflow its container.
• boil awayTo boil a liquid until it has turned entirely to steam/vapor.