Meaning of “bracket” - Learner’s Dictionary

bracket

verb [ T ] uk us /ˈbrækɪt/
SYMBOL

to put curved lines ( ) around words, phrases, numbers, etc to make them separate

GROUP

to consider two or more people or things to be similar:

[ often passive ] Canadian accents are often bracketed with American accents.

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