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1. A traffic jam in which no vehicular movement is possible, especially one caused by the blockage of key intersections within a grid of streets.
2. A complete lack of movement or progress resulting in a backup or stagnation: "the political gridlock that prevented ... the President and Congress from moving expeditiously to cut the budget" (Robert D. Hormats).
1. (of urban traffic) obstructed by queues of vehicles forming across junctions and causing further queues to form in the intersecting streets
2. (of a dispute, etc) at a point at which no agreement can be reached; deadlocked
(with traffic) to be gridlocked [road] → être embouteillé(e)
(at stalemate) to be gridlocked [talks] → être dans l'impasse