RULE OUT is a term that means to reject or forbid something. The crossword solutions for this term are DEBAR (5 letters), PROHIBIT (8 letters), DISQUALIFY (10 letters), PROSCRIBE (9 letters), BAN (3 letters), BAR (3 letters), NIX (3 letters), BATE (4 letters), OMIT (4 letters), NEGATE (6 letters), EXCLUDE (7 letters), FORFEND (7 letters), DISALLOW (8 letters), STAVEOFF (8 letters), and ELIMINATE (9 letters). All of these words have similar meanings, but each one has a slightly different nuance. For example, DEBAR implies a more permanent rejection, while OMIT implies a temporary exclusion.