The term 'loses one's cool' is an idiom that means to become angry or frustrated. The crossword solutions for this term are GETSMAD (7 letters), SNAPS (5 letters), PANICS (6 letters), GOESAPE (7 letters), HASAFIT (7 letters), SEESRED (7 letters), and BOILSOVER (9 letters). All of these words describe a person who has become so angry or frustrated that they have lost their composure. GETSMAD, SNAPS, and HASAFIT all refer to the person becoming angry, while PANICS, GOESAPE, SEESRED, and BOILSOVER refer to the person becoming so angry that they lose control of their emotions.