Meaning of “hear warning bells” in the English Dictionary

british dictionary

"hear warning bells" in British English

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hear warning bells

also warning bells start to ring/sound

used to describe a situation when people see signs that something bad has started or is going to happen:

For me, the warning bells started to ring when she lost all that weight.

(Definition of “hear warning bells” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)