Give me a break!

Give me a break!

 and Gimme a break! 
1. Inf. Don't be so harsh to me!; Give me another chance! I'm sorry! I'll do better! Give me a break! I was only late once! Give me a break!
2. Inf. That is enough, you're bothering me!; Stop it! Do you have to go on and on? Give me a break! Give me a break, you guys! That's enough of your bickering!
3. Inf. I don't believe you!; You don't expect anyone to believe that! You say a gorilla is loose in the city? Gimme a break! Tom said he was late again because the back stairs caved in. His boss said, "Gimme a break!"
See also: give

Give me/us a break!

  (American & Australian informal)
something that you say when you do not believe what someone has just said 'You're going to run a marathon? Give me a break!'
See also: give

Give me a break!

and Gimme a break!
1. exclam. That is enough!; Stop it! Do you have to go on and on? Give me a break!
2. exclam. Don’t be so harsh!; Give me a chance! I’m sorry! I’ll do better! Give me a break!
3. and GMAB exclam. & comp. abb. I don’t believe it!; You don’t really think I believe that! Come on, GMAB! How dumb do you think I am!
See also: give