WordNet sense 1 (prevent the occurrence of; prevent from happening):

avert, avoid, debar, obviate, ward off, fend off, head off, stave off

WordNet sense 2 (turn from a straight course , fixed direction, or line of interest):

bend, turn away

WordNet sense 3 (draw someone's attention away from something):

distract

WordNet sense 4 (impede the movement of (an opponent or a ball)):

block, parry