D defs.my
Entry 2 senses Webster, 1913

deadlock

/dĕd'-läkˌ/ · dead·lock · IPA /ˈdɛdˌlɑk/
01 n. A lock which is not self-latching, but requires a key to throw the bolt forward.
  1. 1.
    A lock which is not self-latching, but requires a key to throw the bolt forward.
  2. 2.
    A counteraction of things, which produces an entire stoppage; a complete obstruction of action.
    “Things are at a deadlock.” — London Times.
    “The Board is much more likely to be at a deadlock of two to two.” — The Century.