godan verb (-su), intransitive verb
break down crying; cry one's heart out
Describes collapsing emotionally and crying uncontrollably, often with the nuance of being overwhelmed by grief or despair.
悲しい知らせを聞いて、彼女はその場に泣き伏した。
Upon hearing the sad news, she broke down crying on the spot.
彼は母親の
He broke down crying over his mother's death.