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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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.
If someone has a great and sudden change in their ideas or beliefs, then this is a road to Damascus change, after the conversion of Saint Paul to Christianity while heading to Damascus to persecute Christians.