Gets Hot Under the Collar is an idiom that means to become very angry or frustrated. This phrase is often used to describe someone who is so angry that their face turns red and they start to sweat. The crossword solutions for this term are BOILS (5 letters), STEAMS (6 letters), and SEESRED (7 letters). Boils can be defined as a state of intense anger, while steams is another word for boiling and seesred is a slang term for becoming very angry.