the world > movement > motion in specific manner > alternating or reciprocating motion > [noun] (54)
figurative. The action or fact of moving up and down (or back and forth) constantly or repeatedly; esp. fluctuation.
Subcategories:
— to-and-fro (4)
— backwards and forwards (5)
— movement like oars (1)
— thing or person moving to and fro or up and down (2)
— jogging or jolting to and fro or up and down (14)
— bobbing (1)
— nodding the head (5)
— flapping or beating up and down (6)
— rise and fall (4)
— undulatory motion (11)