Answer:

waggle

Answer	Crossword Clue
WAGGLE	Shake, as a duck's tail
WAGGLE	Shake while in motion
WAGGLE	Part of some golfers' pre-shot routines

WAGGLE	Rapid to-and-fro movement
WAGGLE	Move shakily
WAGGLE	Move in a shaky manner.
WAGGLE	Swing to and fro.
WAGGLE	Wave about
WAGGLE	Shake
WAGGLE	Go back and forth
WAGGLE	Move rapidly from side to side

WAGGLE	Move from side to side, as animal tails