Cut someone some slack /give one some slack

Cut someone some slack /give one some slack : dar uma folga para / “dar um tempo” para alguém / não ser tão rigoroso com alguém

“Cut him a little slack:  his father just died.”  (www.macmillandictionary.com)

Cut me some slack and I'll be sure to pay you all I owe in a month. (www.thefreedictionary.com)