Burst Out -

is a common phrasal verb used to describe a sudden, often uncontrollable, release of sound or emotion. It is most frequently used to express immediate reactions like laughing or crying. Core Meanings BURST OUT Definition & Meaning - Merriam-Webster

1. : to begin (doing something) suddenly. They both burst out laughing. 2. : to say (something) suddenly. Merriam-Webster BURST OUT | English meaning - Cambridge Dictionary burst out