Draw the Line
WordNet

verb


(1)   Reasonably object (to) or set a limit (on)
"I draw the line when it comes to lending money to friends!"
WiktionaryText

Verb



  1. To set a boundary, rule, or limit, especially on what one will tolerate.
    I don't mind if they have some fun, but I draw the line at anything that might harm others.
 
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