Burst out is an expression that means to suddenly and unexpectedly release a large amount of energy or emotion. The crossword solutions for this term are SPURT (5 letters), ERUPT (5 letters), and BREAK (5 letters). SPURT is an action verb that means to gush out in a sudden, forceful stream. ERUPT is an action verb that means to burst forth with great force. BREAK is an action verb that means to separate into pieces suddenly and forcefully.