The word get is sometimes used instead of be to form the passive. In such cases, get indicates a change in status or condition. For example,

I got sick after eating the red meat. They will get married tomorrow. He got killed in the accident.

(I became sick.) (They changed from “single” to “married.”) (Something caused him to die.)

Get is often used in idiomatic expressions. For example,

What time will you get done? James got drunk at the party. I hope you get better soon. We got engaged last week.

(What time will you be finished?) (He became drunk at the party.) (I hope you become well soon.) (We became an engaged couple.)