tocsin
alarm bell

A little alarm bell started going off in my head.

And we got a lot of alarm bells going off right now.

Yet at the time, word of the meeting did not set off alarm bells in Washington.

Those were hard words, but they seemed not to have set off alarm bells among the other children.

"Anyone with a sense of history can hear alarm bells go off."

"The question is how he got in the country without everyone's alarm bells going off."

That should have been enough to set off alarm bells in her head.

All the same, I'll listen tonight for the alarm bell.

But then he was aware of something else and an alarm bell went off inside his head.

In fact, the alarm bell had been broken for two years.