Understanding Belching

It is the noisy release of gas (mostly swallowed air) from the stomach/esophagus through the mouth.

Eating, drinking carbonated beverages, or chewing gum.

A disguise is when you change how you look (like wearing a costume, hat, or makeup) so people don't recognize you, or to pretend to be someone else, like a superhero, a different job, or even an animal for fun, like a Halloween costume. It's like hiding your true self by changing your clothes or appearance to trick others, as seen in cartoons or when someone wears a mask.  

making a very strong promise (like "I swear I'll be good!") or using "bad words" that are considered impolite, rude, or meant to be hurtful, which kids are usually told not to do because they can upset people