desperdiciar
dehs-pehr-dee-see-ahr
to waste
1. No desperdicies agua, Sebas. Cierra la llave, por favor.
Don't waste water, Sebas. Turn off the tap, please.
2. No desperdicies tu tiempo con él. No está buscando una relación seria.
Don't waste your time on him. He's not looking for anything serious.
I read it as despedirse, to say goodbye, must watch that