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the rock stars had to fend off the screaming and swarming girls as they exited the building
Fend off, mate!
Fend Off is to attack.
This is because a parry can be used to "blow" and fend off can be attacking.
The present tense of "fend" is "fends." For example, "He fends off criticism."
Justin Bieber has to fend off all the screaming girls when he tours.