Definition of on the boil
- The deal is still on the boil.
- kept their romance on the boil
- She put the kettle (of water) on the boil.
: to come to the boiling point
: to generate bubbles of vapor when heated
: to cook in boiling water
: a localized swelling and inflammation of the skin resulting from infection of a hair follicle and adjacent tissue, having a hard central core, and forming pus
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