on the boil
Prepositional phrase
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(Of a heated liquid) simmering strongly and about to boil.
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(colloquial) About to happen; imminent.
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(Of a heated liquid) boiling.
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(colloquial) continuing; active; in a state of activity or development.
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(colloquial) Going smoothly; working well.
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(sport, colloquial) Playing exceptionally well.
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rugby