walk in on
US /wɑːk ɪn ɑːn/
UK /wɑːk ɪn ɑːn/

1.
entrare e sorprendere, cogliere in flagrante
to enter a room and see someone doing something private or embarrassing
:
•
I accidentally walked in on them while they were changing.
Sono accidentalmente entrato mentre si stavano cambiando.
•
She didn't want anyone to walk in on her while she was practicing her dance moves.
Non voleva che nessuno entrasse mentre si esercitava con i suoi passi di danza.