waver
US /ˈweɪ.vɚ/
UK /ˈweɪ.vɚ/

1.
vacilar, flaquear, dudar
to be undecided between two opinions or courses of action; be irresolute
:
•
He started to waver on his decision to move abroad.
Empezó a vacilar en su decisión de mudarse al extranjero.
•
Her confidence began to waver as the deadline approached.
Su confianza empezó a flaquear a medida que se acercaba la fecha límite.
2.
titilar, vacilar, temblar
to move in a quivering way; flicker
:
•
The flame of the candle began to waver in the draft.
La llama de la vela empezó a titilar con la corriente de aire.
•
His voice did not waver, even under pressure.
Su voz no vaciló, ni siquiera bajo presión.