The phrase "to hit the crossbar" means that in a sport like soccer or hockey, a player has kicked or shot the ball/puck in a way that it hits the horizontal bar (crossbar) that connects the goalposts, but does not go into the goal.
Sentences with «to hit the crossbar»
If either side hit the crossbar in the Tottenham v Chelsea match, Boylesports will double winnings on all markets! (football-bookmakers.com)
Coutinho made it 2 following a strong start to the second half from the Reds, with a composed drive into the bottom left corner after Wijnaldum hit the crossbar with a volley. (anfieldindex.com)
Moments later Munster hit the crossbar from a direct free kick. (wiganathletic.com)