WordNet sense 1 (pull away from a source of disgust or fear):

shrink back

WordNet sense 2 (use a surgical instrument to hold open (the edges of a wound or an organ)):

pull back

WordNet sense 3 (pull inward or towards a center):

draw in

WordNet sense 4 (formally reject or disavow a formerly held belief, usually under pressure):

abjure, forswear, recant, resile