A gatekeeper is someone who is in charge of a gate or a door. They are usually responsible for keeping the peace and preventing chaos from happening.
To precipice is to reach the edge of a cliff or a slope. If you're walking on a precipice, you're very likely to fall down.
To be beholden is to be indebted to, or to have a strong obligation to. Someone who is beholden to a debt must pay it back no matter what.
To poof something is to make it disappear suddenly. If you poof a balloon, it pops and the air inside it goes away.
When something is saggy, it is loose and droopy. This can be a problem if it is hanging from something, or if it is just lying flat.
To codify is to create a system or code for something. This can be done in a number of ways, including by making a list of all the rules, by creating a dictionary, or by creating a set of guidelines.
To bartend is to serve drinks to customers. A bartender usually works in a bar or club.
A phenom is someone who is very talented or successful. They are usually known for doing something very well for a very long time.