cross a line

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.
See also:
  • cross the line
  • not done
  • argue back
  • disapprove
  • disapprove of
  • disapprove of (someone or something)
  • out of keeping
  • out of keeping with (something)
  • excuse my French
  • excuse/pardon my French