cry your eyes out
US /kraɪ jʊər aɪz aʊt/
UK /kraɪ jʊər aɪz aʊt/

1.
to cry a lot and for a long time
:
•
She would cry her eyes out every time she watched that sad movie.
•
When his dog died, he cried his eyes out for days.
to cry a lot and for a long time