godan verb (-su)
cry one's eyes out; weep oneself blind
Expresses crying so intensely that it feels as if one's eyes or body might break. Often used hyperbolically.
悲しすぎて泣き潰しそうになった。
I was so sad I almost cried my eyes out.
彼女は一晩中泣き潰した。
She cried her eyes out all night.