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general::
Phrase(s): One has to draw the line somewhere.
Prov. It is necessary to set limits and enforce them. • Ellen: This is the fifth night this week that my son has stayed out too late. Jane: Why not punish him, then? You have to draw the line somewhere. • I am a fairly easygoing employer, but I cannot allow my employees to take two hours for lunch. I have to draw the line somewhere.
McGrawhill's American Idioms And Phrasal Verbs