From Longman Dictionary of Contemporary Englishhit the wallhit the wallinformalDS to reach the point when you are most physically tired when doing a sport → wall
Examples from the Corpus
hit the wall• I miss and hit the wall.• Each time the ball hits the wall a brick disappears and you're closer to your aim of breaking down the wall.• Witnesses swear that as fast as the line drive hit the wall, Rivera was rounding second before it touched the ground.• It hit the wall four feet below him.• It hit the wall near the window and smashed.• It gathers speed, and suddenly hits the wall by the foot of the bed.• During the 1982 recession, the deepest since the Depression, state governments began to hit the wall.• He expected to hit the wall of the cliff somewhere up ahead. 