This
database is a comprehensive collection of all the American idioms and slang available.
American Idioms are many and varied. We hope you enjoy our collection. We are adding more all the time.
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When someone is wearing a plastic smile, they are appear to be happier with a situation or events than they actually are. This is actually a description of the forced smile you might see in many photographs.
This means that if you do bad things to people, bad things will happen to you, or good things if you do good things. It is normally used when someone has done something bad.