deadfallPronunciation: /ˈdɛdfɔːl/Definition of deadfall noun North American 1a trap consisting of a heavy weight positioned to fall on an animal. 2 [mass noun] a tangled mass of fallen trees and brush: the brush and deadfall along the river stopped us cold [count noun] a fallen tree: the deadfall was a poplar about ten inches in diameter 3 informal a disreputable drinking place: I’ve been on a few benders in deadfalls along the Alaska Highwaydeadfall in other Oxford dictionaries Definition of deadfall in the US English dictionary