From Longman Dictionary of Contemporary Englishbe out of linebe out of line informal a) to say or do something that is not acceptable in a particular situation You just keep quiet! You’re way out of line. b) to not obey someone, or to do something that you should not doget/step out of line Anybody who steps out of line will be in deep trouble. → line
Examples from the Corpusbe out of line• In some instances, the amounts appear to be out of line with their proper share, the report says.