bell-bottoms
US /ˈbelˌbɑː.t̬əmz/
UK /ˈbelˌbɑː.t̬əmz/

1.
trousers that are wide below the knee
:
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She wore a pair of vintage bell-bottoms to the disco party.
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Bell-bottoms were a popular fashion trend in the 1970s.
trousers that are wide below the knee