Blow one's stack is an idiom that means to become extremely angry and lose control. The crossword solutions for this term are ERUPT (5 letters), FUME (4 letters), RAGE (4 letters), SEERED (6 letters), and LETLOOSE (8 letters). All of these words can be used to describe a person who is in a state of extreme anger, with ERUPT and LETLOOSE being the most intense. FUME and RAGE suggest a more moderate level of anger, while SEERED implies a simmering anger that has been building up over time.