人活脸，树活皮 A person lives by face, a tree lives by its bark. A person must guard his good name. Also 人要脸，树要皮.
打人休打脸，骂人休揭短 When hitting someone, do not hit the face. When scolding someone, do not expose his faults.
揭短 To expose a person’s shortcomings and make them public.
得饶人处且饶人 Where one can spare a person, spare him. To be tolerant and leave room. The line is from the Song writer Yao Kuan.
留余地 To leave room. Not to go to extremes in speech or action, so that there is space to turn back.