Burst forth is an expression that means to suddenly appear or emerge. The crossword solutions for this term are BELCH (5 letters), ERUPT (5 letters), ERUPTED (7 letters), SPEW (4 letters), and EXTEND (6 letters). BELCH is an informal word meaning to expel gas from the stomach through the mouth. ERUPT is a verb meaning to suddenly burst forth, often with force. Erupted is the past tense of ERUPT. SPEW is a verb meaning to forcefully eject something from the mouth. EXTEND is a verb meaning to stretch out or expand.