The term 'strike with open hand' can be summarized by two crossword solutions: CUFF (4 letters) and SLAP (4 letters). Cuffing is a form of striking with an open hand, usually done by slapping the back of the hand against the side of someone's head or neck. Slapping is another form of striking with an open hand, usually done by striking the face or body with the palm of the hand. Both cuffing and slapping are considered forms of physical assault and are illegal in many countries.