Meaning of “braces” - Learner’s Dictionary

braces

noun [ plural ] uk us /ˈbreɪsɪz/
FOR TROUSERS UK (US suspenders)

two straps fixed to a pair of trousers that go over your shoulders and stop the trousers from falling down

TEETH

US (UK brace) a set of wires that some children wear to make their teeth straight

(Definition of “braces” from the Cambridge Learner’s Dictionary © Cambridge University Press)