表达 “cry someone’s eyes out” 的字面意思是 “把眼睛都哭出来了”，实际意思是 “因非常沮丧而痛哭，大哭一场”。

例句
She cried her eyes out as she waved her boyfriend off at the airport.
当她在机场挥手告别男友时，泣不成声。

I couldn’t stop crying my eyes out while watching the sad film.
看这部悲伤的电影时，我不禁泪流满面。

He cried his eyes out at the thought of going back to school.
一想到要开学，他就哭天喊地。