The Oxford Thesaurus An A-Z Dictionary of Synonyms - deadlockn.

1) standstill, impasse, stalemate, stand-off, draw, stoppage, Colloq US Mexican stand-off: Union and management negotiators have reached a deadlock on the pension issue. --v. 2) bring or come to a standstill or impasse, stall, stop, halt: The Congress is likely to deadlock on the question of expanding national health benefits.