to set (the) alarm bells
[raise] alarm bells[set|sound|ring|raise] an alarm bellto set (the) alarm bells
01
to cause fear or concern by showing a warning sign
Idiom
Informal
أمثلة
And the way he was looking at me — it made the alarm bells ring even louder.
Her statement should have rung alarm bells but nobody took the precaution of checking the facts.
