subir
go up
sub-
under, below
+
-ir
verb suffix
The Spanish verb subir means to go up. While it may seem counterintuitive, you can remember it by thinking of the English prefix sub-0 (under, below0) and imagining going up from below. The -ir1 ending indicates it's a verb1.
verb
  1. go up
    To go up or ascend
    Vamos a subir la montaña. // We're going to climb the mountain.
  2. increase
    To increase or raise
    Van a subir los precios. // They're going to raise the prices.
  3. upload
    To upload or post online
    Voy a subir las fotos a Instagram. // I'm going to upload the photos to Instagram.