(UK, Australia) To cease to boil when heat is no longer applied.
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(idiomatic, UK, Australia) To diminish in intensity or urgency.
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(idiomatic, UK, Australia) To lose interest; to pall.
That is the reason for the coin. You will be able to hear it dancing about, and it will tell you if the water goes off the boil or is getting dangerously low.
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Add your own interpretation of "go off the boil".
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.