This is the 3859th most frequent Spanish word.
suya
"Suya" means "his," "hers," "yours" (formal), or "theirs" when referring to possession.
In this sentence, 'suya' is a possessive pronoun used to indicate that the house belongs to the person referred to by the pronoun 'su'.
La casa es suya.
The house is hers/his/theirs.
Here, 'suya' acts as a possessive pronoun, showing that the decision was made by the person referenced.
La decisión fue suya.
The decision was hers/his/theirs.
In this case, 'suya' emphasizes possession and exclusivity, indicating that the idea belongs to the referenced individual.