The term 'act like a couch potato' is an idiom that means to be lazy and inactive. The crossword solutions for this term are LAZE (4 letters), LOLL (4 letters), LOAF (4 letters), and VEGOUT (6 letters). LAZE means to be idle or sluggish, LOLL means to recline in a relaxed manner, LOAF means to spend time doing nothing in particular, and VEGOUT means to relax and do nothing. All of these words describe the same behavior of being lazy and inactive.