stymie

Synonyms: balk block choke off confound corner crab cramp cramp one’s style crimp cut off dead-end defeat foil give the run around hang fire hang up hold off hold up impede mystify nonplus obstruct pigeonhole prevent put on back burner put on hold puzzle shelve snooker stall stonewall stump throw a monkey wrench into thwart

Antonyms: aid assist encourage help