Meaning of “waistline” in the English Dictionary

"waistline" in American English

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waistlinenoun [ C ]

us /ˈweɪst·lɑɪn/

waistline noun [ C ] (CLOTHING PART)

the part of a piece of clothing that covers the waist

waistline noun [ C ] (PERSON'S SIZE)

the measured size of your waist:

When he went off his diet, his waistline started to grow.

(Definition of “waistline” from the Cambridge Academic Content Dictionary © Cambridge University Press)