BELCHING

To expel (gas) loudly from the stomach through the mouth.

"My father used to belch after having a fine meal."

To eject or emit (something) with spasmodic force or noise.

"Yes, we have seen the wrecked cars and the factories belching smoke and the blur of speedy automobiles crowding highways."

To be ejected or emitted (from something) with spasmodic force or noise.

The act of producing a belch.