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

1.
들어오다, 목격하다
to enter a room and see someone doing something private or embarrassing
:
•
I accidentally walked in on them while they were changing.
그들이 옷을 갈아입는 동안 실수로 들어갔다.
•
She didn't want anyone to walk in on her while she was practicing her dance moves.
그녀는 춤 동작을 연습하는 동안 아무도 들어오지 않기를 원했다.