The term 'beat up' can be defined by the following crossword solutions: maul (4 letters), threadbare (10 letters), hurt (4 letters), strike (6 letters), thrash (6 letters), WORN (4 letters), harmed (6 letters), pummel (6 letters), and shottohhell (10 letters). Maul means to attack someone with great force, threadbare means to be WORN out or frayed, hurt means to cause physical or emotional pain, strike means to hit someone or something, thrash means to beat someone or something violently, WORN means to be damaged from use, harmed means to cause injury or damage, pummel means to hit someone repeatedly, and shottohhell means to be in a very bad state. All of these words describe the act of beating someone up, either physically or emotionally.