The term 'FALL ON' can be solved by three different crossword solutions: ATTACK (6 letters), BESET (5 letters), and ASSAIL (6 letters). All three words are verbs that describe a physical or verbal assault. ATTACK is the most general of the three, meaning to launch a physical or verbal ATTACK on someone or something. BESET is similar to ATTACK, but implies a more persistent or continuous assault. Finally, ASSAIL is the most intense of the three, meaning to make a violent ATTACK on someone or something.