Komorebi
Etymology
A Japanese compound, 木漏れ日, built from ki or ko, "tree(s)," more, "to leak or filter through," and bi or hi, "sunlight" or "day." So it reads almost literally as "sunlight that leaks through trees." The word is ordinary descriptive Japanese; its fame in English comes largely from lists of "beautiful untranslatable words," which is a curatorial choice as much as a linguistic fact.
noun · /koh-moh-REH-bee/
Sunlight filtering and scattering through the leaves of trees.
What it names
The dappled, shifting light and shadow you walk through under a canopy — a thing English can only describe, never name in a word.
Example
We slowed our pace on the forest path, letting the komorebi flicker across our faces.
Related idea
Dappled is an English adjective for the same light-and-shadow effect; komorebi names the phenomenon itself as a noun, and specifically the version made by leaves.