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1. To interrupt someone or something. I'm sorry to burst in, but I have some information that might help. Mom is always using the phone in her office to burst in on my conversations!
2. To force entry into something, often a building. They called the police as soon as they heard someone burst in downstairs. I had to burst in—I didn't have my house key, and no one else was home!
burst in (to some place)
Fig. to intrude or come in thoughtlessly and suddenly. Ted burst into the room and sat down right in the middle of the meeting. Wasn't it very annoying of him to just burst in?
((up)on someone or something) Fig. to intrude or come in thoughtlessly and suddenly and interrupt someone or something. (Upon is formal and less commonly used than on.) I didn't mean to burst in on you. She feared that someone would burst in upon her.
(on someone or something) to enter a room, interrupting someone or some activity. (Often without knocking or seeking permission to enter.) Tom burst in on his sister and her boyfriend while they were kissing. I must askyou not to burst into my office again. Whatever it is can wait.
(with something) to interrupt with some comment. Ted burst in with the good news. He burst in to tell us about his new car.
1. To enter some place suddenly and forcefully: While the gangsters were playing cards, the police burst in and arrested everyone.
2. To interrupt or intrude: I hate to burst in, but you have an important message from work. He burst in to the meeting to let us know that there was a fire drill.