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

1.
entrar e ver, pegar no flagra
to enter a room and see someone doing something private or embarrassing
:
•
I accidentally walked in on them while they were changing.
Eu acidentalmente entrei enquanto eles estavam se trocando.
•
She didn't want anyone to walk in on her while she was practicing her dance moves.
Ela não queria que ninguém entrasse e a visse enquanto ela praticava seus passos de dança.