Alarm bells ring/start ringing phrase
Said when someone is starting to feel worried, concerned or suspicious
Mary, to whom I hadn't talked for years, suddenly sent me a request to borrow a great deal of money yesterday. At the moment, alarm bells were ringing
When he flashed his beguiling smile, alarm bells started to ring in my head.
If you come home and your house looks messier than before you leave, alarm bells should ring.
To tell someone to leave or stay away from a dangerous situation or trouble
The verb "ring" or "start" must be conjugated according to its tense.
The origin of this phrase is not clear.
A problem or difficult circumstance
I'm short-sighted, so forgetting my glasses is a real hair in the butter for my sight.