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Keywords:
Reciprocating,
Backward,
Unsteadily,
Vibratory,
Fro
A vibratory or reciprocating motion.
To move with a reciprocating motion; to move backward and forward, or upward and downward.
To cause to move backward and forward in seesaw fashion.
Moving up and down, or to and fro; having a reciprocating motion.
move up and down as if on a seesaw
move unsteadily, with a rocking motion
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