noun

grown-up

adult, grown-up

Ask a grown-up to help you.

Ask a grown-up to help you.

That was a very grown-up thing to do.

That was a very grown-up thing to do.

((noun)) an adult person Ask a grown-up to help you.

((adjective)) behaving in a responsible way That was a very grown-up thing to do.

Synonyms: adult; Antonyms: child, kid

A compound of 'grown' (past participle of grow) and 'up'. Literally, someone who has grown up.

It's a simple combination of two easy words: 'grown' and 'up'. Someone who has 'grown up' is a grown-up.

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