American Dictionary

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Definition grown-up in American English

grown-up noun

[countable] noun
1

an adult. This word is used mainly by children or when speaking to children.

Example

Ask a grown-up to help you.

Synonyms and related words
1.1

used when there are children involved in a situation

Example

The kids went to the park while we grown-ups sat in the backyard.

Synonyms and related words
2

someone who behaves in a mature and thoughtful way, especially in politics

Example

It's time for grown-ups who deal in reality to retake the reins of government.

Synonyms and related words
Definition grown-up in American English