cross the line

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cross the line

1. To act in an inacceptable or inappropriate way, Speaking that rudely to your teacher definitely crosses the line.
2. To misbehave or do something wrong. When you spoke that rudely to your teacher, you definitely crossed the line.
See also: cross, line

cross the line

COMMON
1. If someone crosses the line, they start behaving in an unacceptable or offensive way. The show's pretty outrageous, but I don't think it crosses the line. There was no reason to bring our families into it. That's crossing the line.
2. If someone or something crosses the line, they go from one situation or activity to another more extreme one. They could easily cross the line from civil disobedience to violence. Congress and the public were not informed about the decision to cross the line from defense to preparation for war. Note: The `line' in this expression may refer to boxing matches in the past, when a line was drawn on the ground which neither boxer could cross. `Draw the line' may be based on a similar idea.
See also: cross, line