How to Say "pledge" in Spanish
The Spanish word for “pledge” is “voto” — B2 level.
English → SpanishB2
nounB2formal
a serious commitment

Examples
Los monjes hicieron un voto de pobreza y humildad.
The monks took a vow of poverty and humility.
Ella cumplió su voto de visitar la iglesia todos los domingos.
She fulfilled her vow to visit the church every Sunday.
Romper un voto es considerado una falta grave.
Breaking a vow is considered a serious offense.
The Verb 'Hacer'
To express the act of taking or making a vow, Spanish uses the verb 'hacer' (to do/make): 'hacer un voto'.
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