Final answer:
A common term for the release of gas from the digestive system is either a belch or a fart, depending on whether the gas is released through the mouth or the anus.
Step-by-step explanation:
The term commonly used to describe the release of gas from the digestive system is either a belch when it is released through the mouth or a fart when it is expelled through the anus. These are normal processes and are part of the body's way of releasing excess gas from the digestive tract. The gas can be produced through the breakdown of certain foods by bacteria in the large intestines, by swallowing air, or during the digestive process itself.