walk in on - definition and synonyms

phrasal verb [transitive]
present tense
I/you/we/theywalk in on
he/she/itwalks in on
present participlewalking in on
past tensewalked in on
past participlewalked in on
  1. walk in on someone to walk into a room where someone is doing something private or secret

    More than once, he walked in on them kissing.

See also main entry: walk