Mexican standoff

(slang) An inconclusive standoff, ending in mutual retreat.

(slang) A confrontation among two or more armed parties, none of which wants to attack first (fearing that the other could retaliate), but neither of which will disarm (for fear the other will attack).

(slang) A three-way or more standoff.

(slang, poker) A pot that is split among the players because of a tie.

(rail transport) A near-collision between two trains; an averted cornfield meet.