descargar
download
des-
un-, de- (reversal or removal)
+
cargar
to load
Descargar means to download and can be thought of as des-0 (un- or de-0) + cargar1 (to load1), literally meaning 'to unload' or 'to de-load'.
verb
  1. download
    To download or transfer data from one device to another
    Voy a descargar la aplicación en mi teléfono. // I'm going to download the application on my phone.