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boil away

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boil something away

 

1. Lit. to boil a liquid until it is gone altogether. She left the kettle on and boiled the water away. Boil away some of that water.

2. Lit. to remove a volatile chemical from a solution by boiling. Boil the alcohol away or the sauce will be ruined. You should boil away some of the liquid.

See also: away, boil