cut off: This expression can mean three serious things:
God judged the person, and they died early from natural causes (Leviticus 17:10–14).
The community executed the person (see Exodus 31:14).
The person lost membership in Israel. This was either by expulsion (like excommunication) or being shunned and treated as ceremonially unclean (Leviticus 18:24–30; see 23:29–30, where "cut off" seems different from "destroy").