Как по Английски будет положить предел

phrase

Set a limit on what one is willing to do or accept.

Примеры использования:

I draw the line at a pizza with anchovies on it

idiom

To put a limit on what you will do or allow to happen, esp. because you feel something is wrong

Примеры использования:

I’ll do whatever my company asks me to, but i draw the line when someone asks me to lie for them.