1. slang To escape from a place or thing (often prison). That criminal did bust out, but he was caught only a mile from the prison.

2. slang To help one to escape from a place or thing (often prison). In this usage, a noun or pronoun is typically used between "bust" and "out." We can't just leave him here to rot in a jail cell—we have to bust him out! Don't worry, I'll pull the fire alarm and bust you out of detention.

3. To bring out something for use. Bust out the champagne—we've got an engagement to celebrate!

4. To suddenly perform a particular action. My mother seemed fine this morning but then busted out crying at the funeral. The kids busted out laughing when the clown fell down on stage.

5. To pop out of something, often clothes that are too small. I'm sorry, but that top just doesn't fit you—you're practically busting out of it!

6. slang To dismiss or expel someone from school. The committee evaluating the plagiarism charges ultimately decided to bust the student out of school.