Break wind
Definition 1 of 1
Pro Tip 1/3Colloquial Usage
The phrase is informal and often considered rude if used in polite company or formal situations. 
At the formal dinner, he left the room to break wind.
Pro Tip 2/3Humor or Embarrassment
Often used in humorous contexts or to express someone's embarrassment about this natural bodily function. 
The kids giggled when they heard someone break wind during the quiet exam.
Pro Tip 3/3Avoid in Public
It's commonly seen as impolite to break wind in public spaces or social gatherings. 
She was mortified after accidentally breaking wind in the crowded elevator.