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deadlock (n.)

1779, "complete standstill," from dead (adj.), in its emphatic use, + lock (n.1). First attested in Sheridan's play "The Critic." By 1808 as "type of lock worked on one side by a handle and the other by a key." Deadbolt as a type of lock also is from 1808.

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Definitions of deadlock

deadlock (n.)
a situation in which no progress can be made or no advancement is possible;
From wordnet.princeton.edu