oscillate
intransitive-verb
UK: /ˈɒs.ɪ.leɪt/
US: /ˈɑː.sə.leɪt/
To move repeatedly from one position to another.
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The fan continues to oscillate for a few minutes after it's turned off.
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The needle on the gauge will oscillate wildly if there is a problem with the pressure.
To change your mind or opinions frequently.
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My feelings about the movie oscillate between love and hate.
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Her moods seemed to oscillate between happiness and deep depression, which worried her family.
To vary repeatedly in magnitude or position around a central point.
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The value of the company's stock may oscillate during periods of uncertainty.
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The frequency of the sound waves will oscillate depending on the source's movement and atmospheric condition.