noun, noun or participle which takes 'suru'
burst out laughing; break into a hearty laugh
A yojijukugo describing a sudden, broad, and cheerful laugh, often used in literary or formal contexts. Can be used as a noun or with する.
彼の冗談に、会場は破顔大笑した。
At his joke, the audience burst into hearty laughter.
その話を聞いて、思わず破顔大笑してしまった。
Hearing that story, I couldn't help but break into a big laugh.