waver
verb
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be unsure or weakfalter
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give off unsteady sounds, alternating in amplitude or frequencyquaver
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sway to and froweave
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move or sway in a rising and falling or wavelike patternfluctuatevacillate
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move back and forth very rapidlyflutter
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move hesitatingly, as if about to give wayfalter
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pause or hold back in uncertainty or unwillingnesswafflehesitate
noun
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the act of moving back and forthflutter
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the act of pausing uncertainlyfalteringhesitationfalter
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someone who communicates by waving