Cut somebody some slack - Idioms by The Free Dictionary
cut somebody some slack
cut (one) some slack
To allow one more latitude or freedom than usual; to be lenient with one. Oh, you know I never make requests like this, cut me some slack. A: "I can't believe she talked to me like that!" B: "You need to cut her some slack—she's grieving right now."
cut somebody some ˈslack (informal, especially American English) make things easier than usual for somebody; allow somebody more freedom to do things than they would normally have: I know I made a mistake, but it’s my first week on the job, so cut me some slack, OK?