Used other than as an idiom: see out of, line.(phrase)
Inappropriate or unsuitable, especially by reason of being unmannerly or indelicate.(phrase)
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Use "out of line" in a sentence
"Discreetly, the SWAT teams, locked and loaded, moved to holding points just out of line of sight of the house."
"“If Mary Ross gets out of line today, I promise you, Graham Peters, I will hurt that woman.”"
"Their mission proved that course-correction maneuvers could be done out of line of sight and out of communications with Earth, that a craft could be tracked from an immense distance, and that it could successfully orbit the Moon and return."