plastic grin Meaning A forced, artificial smile; a smile som | English Choice

plastic grin

Meaning
A forced, artificial smile; a smile someone wears despite having no feelings of happiness or joy.

For example

John seemed fine at first glance, but before long I could tell that he was wearing a plastic grin and that something was bothering him.

Look at his big plastic grin—he's such a con man! I sure hope he doesn't win the election.

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