The term 'knock back' is a phrase used to describe the act of consuming an alcoholic beverage quickly. The crossword solutions for this term are DRINK (5 letters), GULP (4 letters), GUZZLE (6 letters), REBUFF (6 letters), and DECLINE (7 letters). All of these words can be used to describe the act of drinking alcohol quickly, with GULP and GUZZLE being the most commonly used terms. REBUFF and DECLINE, on the other hand, are used to describe the act of refusing to DRINK alcohol.