Definitions
1.VerbTo inadvertently prevent (a person, particularly oneself) from entering a place, by leaving it locked."I've locked myself out of my room again!"
2.VerbTo prevent from accessing a data structure."The synchronize keyword locks out all other threads trying to access the object."
3.VerbTo 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.VerbTo be unable to concentrate."Bro, I am totally locked out on this assignment."
5.NounMisspelling of lockout.