IPA: /ˈsaɪd.wɚdz/
KK: /ˈsaɪd.wɚdz/
In a direction that is to the side, rather than forward or backward.
The cat moved sidewards to avoid the dog.
Sidewards → It is formed from "side" (from Old English "side", meaning the lateral part of something) and "-wards" (meaning in the direction of). The word "sidewards" means in the direction of the side.
Think of moving in the direction of the 'side' — that's what 'sidewards' means.