IPA: /ˈɜːrθwɜːrd/
KK: /ˈɜrθwərd/
In the direction of the earth or ground.
The bird flew earthward as the storm approached.
Earthward → It is formed from "earth" (from Old English *eorþe*, meaning the ground or soil) and "-ward" (meaning in the direction of). The word "earthward" means in the direction of the earth or towards the ground.
Think of moving 'towards' ('-ward') the 'ground' ('earth') — that's why earthward means heading in the direction of the earth.