Question

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Answer 1

Hi

Enough is enough

http://idioms.thefreedictionary.com/Enough+is+enough

Comments

Good +

Answer 2

We can simply say: Stop it.

 

stop it/that

 SPOKEN

used for telling someone not to do something that they are doing

Stop it! You'll hurt him!

http://www.macmillandictionary.com/dictionary/british/stop#stop-it-that

Comments

Hi

Good one (+1)

Answer 3

Get it done!

Cut it out!

Cut that out!

Answer 4

knock it off ! ( in more aggressive way )