Also spelled fish-belly
noun
adj
Meanings
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1
noun
the underside or belly of a fish
The fishbelly was pale against the dark scales of its back.
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2
adj
pale, whitish, or silvery like the underside of a fish, especially in the compound fishbelly white
A fishbelly light spread across the sky before dawn.
Thesaurus
Etymology
A compound of fish + belly. The literal underside of a fish, often noticeably pale, produced an attributive color comparison in expressions such as fish-belly white.