Also means
to substitute
Usage Note
Sustituir is an -uir verb that inserts a 'y' in stressed present forms (sustituyo, sustituyes, sustituye). It is interchangeable with reemplazar in most contexts. The noun sustituto / sustituta means a substitute or stand-in.
Examples
"Ella sustituyó al director durante su ausencia."
Natural Translation
She substituted for the director during his absence.

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