burst in on/upon somebody/something phrasal verb ( see also ↑ burst )
to interrupt someone or something by entering a room, in a way that embarrasses you or other people:
I’m sorry to burst in on you like this.
burst in on/upon somebody/something phrasal verb ( see also ↑ burst )
to interrupt someone or something by entering a room, in a way that embarrasses you or other people:
I’m sorry to burst in on you like this.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012