• IPA: /ˈvæ.sə.leɪt/, /ˈvæ.sɪ.leɪt/

vacillate (vacillates, present participle vacillating; past and past participle vacillated)

  1. (intransitive) To sway unsteadily from one side to the other; oscillate.
    • 1910: Jack London, The Heathen
      Its [the barometer's] normal register in the Paumotus [the Tuamotus] was 29.90, and it was quite customary to see it vacillate between 29.85 and 30.00, or even 30.05; [...]
  2. (intransitive) To swing indecisively from one course of action or opinion to another.
    • 2004: Chris Wallace, Character: Profiles in Presidential Courage
      On the streets of Berlin, Ruth and her compatriots vacillated "between hope and despair."
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