The crossword solutions for the term 'strengthen, with 'UP'' are BEEF (4 letters), PROP (4 letters), SHORE (5 letters), and TONE (4 letters). BEEF is a type of meat that is high in protein and can help to build muscle. PROP is short for 'PROP UP, ' which means to support something or someone. SHORE is a noun that refers to the land along the edge of a body of water. TONE is a noun that describes the quality of a sound or the attitude of a person's words. All of these words can be used to describe the act of strengthening something or someone, either physically or emotionally.