a hollow metal object, often like a cup in shape, that makes a ringing sound when hit by a small piece of metal inside it; the sound that it makes

an electrical device which makes a ringing sound when a button on it is pushed; the sound that it makes, used as a signal or a warning

Ring the bell to see if they're in.

The bell's ringing!

The bell went for the end of the lesson.

An alarm bell went off.

(figurative)Warning bells started ringing in her head as she sensed that something was wrong.

(figurative)This decision is going to sound a warning bell to other couples.

Saved by the bell! I thought I'd have to sit here listening to you two argue forever.

LEARNit Dictionary