Definition of “ring/sound alarm bells” - English Dictionary

british dictionary

“ring/sound alarm bells” in British English

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ring/sound alarm bells

If something rings/sounds alarm bells, it makes you start to worry because it is a sign that there may be a problem:

The name rang alarm bells in her mind.

(Definition of “ring/sound alarm bells” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)