1
general::
Phrase(s): Enough is enough.
Prov. That is enough, and there should be no more.; Stop! • Stop asking for money! Enough is enough! • I’ve heard all the complaining from you that I can take. Enough is enough!
McGrawhill's American Idioms And Phrasal Verbs
2
general::
One should be satisfied; stop, there should be no more. For example, No more speeches? enough is enough, or as Robert Southey put it (The Doctor, 1834): "As for money, enough is enough; no man can enjoy more." This expression already appeared in John Heywood's proverb collection of 1546 and is often used as an interjection (first example).
American Heritage Idioms