Yes you are right that the Greek word 'baptizo' (also 'baptisma', and 'baptismos' for baptism) means to dip. However, it also means to cleanse by dipping or submerging, to wash, to MAKE CLEAN WITH WATER, to wash ones self, or to bathe.
Sí, tienes razón, la palabra griega "baptizo" (también "baptisma", y "baptismos" ) significa sumergir. Sin embargo, además significa limpiar por sumergimiento... lavar, LIMPIAR CON AGUA, lavarse uno mismo, o bañarse.