cross a line

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cross a line

1. Of an action, to cross some threshold into unacceptable or inappropriate behavior. Speaking that rudely to your teacher definitely crosses a line.
2. To misbehave or do something unacceptable or inappropriate. When you spoke that rudely to your teacher, you definitely crossed a line.
See also: cross, line
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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