IPA: /ˈwɔːtərˌsaɪd/
KK: /ˈwɔːtərˌsaɪd/
Relating to or located next to a body of water, such as a river, lake, or ocean.
They built a beautiful house at the waterside, perfect for enjoying the view.
The area of land that is next to a body of water, such as a river, lake, or ocean.
We had a picnic at the waterside, enjoying the view of the lake.
Waterside is formed from "water" (from Old English *wæter*, meaning liquid that falls as rain or flows in rivers) and "side" (from Old English *sīde*, meaning a place or location). The word refers to a location beside or near water.
Imagine being at a place right next to the 'liquid' ('water') — that's what 'waterside' means, a location beside the water.