belt1 S2 W3 [countable]
a band of leather, cloth etc that you wear around your waist to hold up your clothes or for decoration:
He unbuckled his leather belt.
a large area of land that has particular features or where particular people live: ➔ green belt
America's farming belt
the green (=countryside) belt British English
a circular band of something such as rubber that connects or moves parts of a machine ➔ conveyor belt, fan belt
unfair or cruel:
That was a bit below the belt, Paul.
The comments hit below the belt (=they were unfair or cruel).
to have achieved something useful or important:
a secretary with several years' experience under her belt
6 British English informal
a belt and braces way of doing something is one in which you do more than necessary in order to make sure that it succeeds