hit a snag

:  to reach with or as if with a sudden blow

:  to come in quick forceful contact with

:  to strike (something, such as a ball) with an object (such as a bat, club, or racket) so as to impart or redirect motion

:  an act or instance of striking or forcefully coming in contact with someone or something :  an act or instance of hitting or being hit

:  a stroke of luck

:  a great success

:  a tree or branch embedded in a lake or stream bed and constituting a hazard to navigation

:  a standing dead tree

:  a rough sharp or jagged projecting part :  protuberance: such as

:  to catch and usually damage on or as if on a snag

:  to halt or impede as if by catching on a snag

:  to hew, trim, or cut roughly or jaggedly