noun

• (computing) An inability to continue due to two programs or devices each requiring a response from the other before completing an operation.
  "If synchronization is always performed in least-first order with respect to object tags, then situations can never arise in which one thread has the synchronization lock for x while waiting for y and another has the lock for y while waiting for x. Instead, they will both obtain the locks in the same order, thus avoiding this form of deadlock."

verb

• (intransitive) To cause or come to a deadlock.
  "A suspect was arrested on November 30 and charged with attempted murder. The evidence against him consisted of two jailhouse informers and an eyewitness who picked him out of a lineup after having identified a different man in an initial photo array. A jury ultimately convicted the suspect of assault after deadlocking twice in three days of deliberation."