clean slate

clean slate  {n. phr.}
A record of nothing but good conduct, without any errors or bad deeds; past acts that are all good without any bad ones.
Johnny was sent to the principal for whispering. He had a clean slate so the principal did not punish him.
Mary stayed after school for a week, and after that the teacher let her off with a clean slate.
Compare: TURN OVER A NEW LEAF.
Categories: noun
Source: A Dictionary of American Idioms

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