obstruct

Synonyms: arrest bar barricade block check choke clog close congest crab curb cut off drag one’s feet fill foul up frustrate get in the way hamper hamstring hang up hide hinder hold up impede inhibit interfere interrupt mask monkey with obscure occlude plug restrain retard sandbag shield shut off slow down stall stonewall stop stopper stymie terminate throttle thwart trammel weigh down

Antonyms: abet aid assist boost clear help promote support