Learn English – word for “back and forth”


I'm struggling with how clumsy the term "back and forth" sounds. Is there a word that essentially means a repetitive back and forth motion?


The machine ____. (moves back and forth, or operates on a back and forth style of motion)

I waved my hand ____ly. (in a back and forth manner)

Best Answer

Oscillates fits the machine example, but not (very well) the hand example.

Possibilities for the hand movement are wildly or repeatedly. The latter could also fit the machine case.

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