-you used
The word utilizasteis is the preterite form of utilizar in the second person plural.
See the full utilizar conjugation


¿El sábado utilizasteis nuestro dormitorio?
On Saturday, did you use our bedroom?
¿Por qué me utilizasteis?
Why you all used me.
¿Cuándo fue la última vez que utilizásteis este lugar?
When was the last time you used this place?
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