zigzagger

noun2

1. •
   Someone who zigzags; a person who makes rapid changes of direction, especially (figuratively) in opinion, policy etc.

   • That is what has long worried many people about Nixon: they saw him as the political man, the born trimmer, the zigzagger and flipflopper, the constantly moving target — 2005
2. •
   An attachment for a sewing machine allowing for zigzag stitches.

   • Join the pieces with overlapping seams and finish off by stitching with the zigzagger attachment. — 1942