Today I've found this phrase:
With great power comes the great chance to get bitten in the rump.
It sounds interesting but I couldn't understand the part to get bitten in the rump.
What does it mean ? Is there a typo ?
This is a variation on the phrase bitten in the ass.
TFD (which is an excellent source for defining idioms) says:
bite (someone) in the ass To punish or take revenge on someone for his or her misjudgment or misdeed(s). Typically the punishment or revenge is not exacted by a person, but as a general consequence for the misbehavior itself. Not used in polite conversation.
Your poor treatment of your employees might come back to bite you in the ass some day.
I got too greedy with my gambling, and now it has bitten me in the ass.
The word rump has been substituted for ass in the sentence you have quoted to make it less vulgar and more polite.