The volcano is belching out flames and smoke.

He who has a frog in his throat begins to belch.

Tom let out a belch.

He belched.

The train belched clouds of black smoke into the air as it chugged away.

Whoever has a frog in his throat begins to belch.

In some cultures, a resounding belch after a meal is considered a compliment to the chef.

It was a spacious harbour, sheltered deep / from access of the winds, but looming vast / with awful ravage, AEtna's neighbouring steep / thundered aloud, and, dark with clouds, upcast / smoke and red cinders in a whirlwind's blast. / Live balls of flame, with showers of sparks, upflew / and licked the stars, and in combustion massed, / torn rocks, her ragged entrails, molten new, / the rumbling mount belched forth from out the boiling stew.

The chimney is belching black smoke.

Every time cattle belch - and, to a smaller extent, flatulate - methane is expelled and enters the atmosphere, where it acts as a greenhouse gas.