Cool it!' is an expression used to tell someone to calm down or take a step back. The crossword solutions for this term include WHOA (4 letters), RELAX (5 letters), STOP (4 letters), CHILL (5 letters), WAIT (4 letters), CEASE (5 letters), DESIST (6 letters), EASEOFF (7 letters), CHILLOUT (8 letters), GETAGRIP (8 letters), COUNTTOTEN (10 letters), SETTLEDOWN (10 letters), HOLDYOURHORSES (14 letters), STOPHURRYINGME (14 letters), CONTROLYOURSELF (15 letters), DONTBEIMPATIENT (15 letters), KEEPYOURSHIRTON (15 letters), TAKEADEEPBREATH (15 letters), WHATSTHEBIGRUSH (15 letters). All of these words and phrases are used to tell someone to slow down and RELAX, and can be seen as synonyms for the phrase 'cool it!'