What it means
If something sets alarm bells ringing, it makes you go hold on, something's off here. It's that instant warning in your head when a deal feels too slick, a story's got holes in it, or someone's moving a bit shady. You don't need full proof yet, just that loud little nope-nope feeling telling you to slow down and watch yourself.
Usage examples
"Something about the offer set alarm bells ringing straight away."
"The moment he asked for the money upfront, alarm bells started ringing."
"When he asked for the deposit in cash, alarm bells started ringing straight away."
"Her story kept changing, and that set off a few alarm bells for me."
"The guy kept dodging basic questions and that had alarm bells ringing for me."
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Where it comes from
It comes straight from actual alarm bells. Once they start ringing, everyone knows there's trouble and it's time to pay attention fast. From there, English stretched it into a figurative warning for anything that suddenly makes you suspicious, uneasy, or ready to stop and look twice.
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