lock out

Verb

lock out (third-person singular simple present locks out, present participle locking out, simple past and past participle locked out)

1. (transitive) To inadvertently prevent (a person, particularly oneself) from entering a place, by leaving it locked.
   • I've locked myself out of my room again!

   Antonyms:

   let in, lock in

2. To prevent from accessing a data structure.
   • The synchronize keyword locks out all other threads trying to access the object.
3. (transitive) (industrial) To prevent (a person, including oneself) from powering up or turning on a machine when doing so would be dangerous (accomplished with objects such as padlocks or zip ties placed through the switch handle, for example)
4. (intransitive, transitive) (colloquial, sometimes humorous) To be unable to concentrate.
   • Bro, I am totally locked out on this assignment.