Noun
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the act of moving back and forth
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the act of pausing uncertainly
"there was a hesitation in his speech"
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someone who communicates by waving
Verb
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give off unsteady sounds, alternating in amplitude or frequency
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sway to and fro
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move back and forth very rapidly
"the candle flickered"
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move or sway in a rising and falling or wavelike pattern
"the line on the monitor vacillated"
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move hesitatingly, as if about to give way
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be unsure or weak
"Their enthusiasm is faltering"
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pause or hold back in uncertainty or unwillingness
"Authorities hesitate to quote exact figures"