deadlock

noun

1 the strike appeared to have reached a deadlock:

stalemate, impasse, checkmate, stand-off;

standstill, halt, stop, stoppage, cessation, dead end;

British full stop.

2 the game ended in a 1–1 deadlock:

tie, draw, dead heat.

3 British the deadlock can only be opened with a key:

bolt, lock, latch, catch, fastening, fastener;

Scottish sneck, snib.

deadlock Oxford Dictionary of English