English version

overgrown schoolboy/child

From Longman Dictionary of Contemporary Englishovergrown schoolboy/childovergrown schoolboy/childBAD BEHAVIOUR OR ACTIONSan adult who behaves like a child – used to show disapproval Stop acting like an overgrown schoolboy. overgrown
Examples from the Corpus
overgrown schoolboy/childEddie is an overgrown schoolboy with a penchant for pulling fleshy faces.
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