lock off

Short definition from Wiktionary

Verb

1. 1
   To stop talking to (someone); to cut (someone) out; to ghost (someone).
2. 2
   To keep (someone) out of (something or someplace) using a lock.
3. 3
   To turn in the warp thread or strands of a piece of cloth when finished to stop strands unravelling.

Noun

1. 1
   Alternative form of lockoff (any sense)