vaciller
to waver, to flicker
verb vah-see-YAY Rare
Origin: Latin vacillare (to sway)
Also means
to totter, to falter
Usage Note
Vaciller applies to physical unsteadiness (a flame, a person about to faint) and to figurative wavering (resolve, memory). La flamme vacille captures the literal use, while sa foi vacillait shows the extended sense. It does not take a direct object.
Examples
"La flamme vacille dans le vent."
Natural Translation
The flame flickers in the wind.
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