AEW star Darby Allin's Mt. Everest trip has been postponed ... 'cause the wrestler broke three bones in his foot right before he was slated to make the climb.
TMZ Sports has learned ... Allin suffered the injury less than two minutes into his match against "Switchblade" Jay White at AEW Dynamite on Wednesday ... when he attempted a front flip off the top rope.
FRONT FOOT FLIP
It goes without saying his landing didn't play out like it was supposed to .