warning bells start ringing

warning bells start ringing

Some issue indicates that one should be concerned about a potentially greater problem or troubling situation. warning bells started ringing among the board members when sales continued to decline for the second straight If your date asks you to meet in a secluded place, warning bells should start ringing.
See also: bell, ring, start, warning
References in periodicals archive ?
'When firms use terms like 'cheap', 'known technology', proven to produce clean fuel', and 'zero-waste system', warning bells start ringing.
If, for instance, you always buy things that cost less than $500 (Dh1,830), and make a no more than a couple of transactions a week, warning bells start ringing (metaphorically speaking, of course) if the system logs five back-to-back transactions of $5,000 each.
When you've known someone a long time and all of a sudden things change, warning bells start ringing - it happened to me in my first marriage.
If warning bells start ringing while you're still in the hairdresser's chair, don't hesitate to stop them immediately.