The term 'rub out' is a slang phrase meaning to DESTROY or ELIMINATE something. The crossword solutions for this term include ANNIHILATE (10 letters), EXTERMINATE (11 letters), OBLITERATE (10 letters), KILL (4 letters), DESTROY (7 letters), ERASE (5 letters), doin (4 letters), SLAY (4 letters), EFFACE (6 letters), GREASE (6 letters), MURDER (6 letters), ERASURE (7 letters), and ELIMINATE (9 letters). All of these words refer to the act of completely destroying or eliminating something, either physically or metaphorically.