~ (out/forth) (sth) to send out large amounts of smoke, flames, etc.; to come out of sth in large amounts （大量）喷出，吐出 SYN spew
to produce a large amount of a substance such as gas or smoke, especially when this is unpleasant or harmful, or to be produced like this:
The exhaust pipe belched out dense black smoke.
The haze is caused mostly by sulphur dioxide belching from coal-burning power plants.
[I] to let air come up noisily from your stomach and out through your mouth 打嗝 SYN burp
He wiped his hand across his mouth, then belched loudly.
他用手抹了抹嘴，然后打了个响亮的饱嗝。