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Definition underbelly in British English

underbelly noun

[countable] noun
/ˈʌndə(r)ˌbeli/
1

the part under an animal's body where the stomach is

Example

the white underbelly of a fish

Synonyms and related words
2

the bottom surface of a plane or other vehicle

Synonyms and related words
3

negative or unpleasant aspects of something which are not widely known or discussed

Example

The article takes a harsh look at the dark underbelly of professional sports.

Definition underbelly in British English