下
カ, ゲ, した, しも, もと, さ.げる, さ.がる, くだ.る, くだ.り, くだ.す, くだ.す, くだ.さる, お.ろす, お.りる, さか, しと

below, down, descend, give, low, inferior

JLPT5 G1 S3 F97

The relevant oracle bone form of this character is a depiction of one line below another, suggesting the idea of *under* (contrast 上) → *low*; *lower*; *below*; *down*; *subordinate*; *descend*. Extended meanings from "down" or "below" include *come/go down*; *fall*; *drop*; *hang* (down/from); *hand down*; *younger*; *have diarrhea*; *abort* (a fetus); *step/move back*; *withdraw*; *leave the capital*; *retire* and *surrender*. By further extension are *carry*, *remove* and *clear a table* (← take down from a table); *grate* (← grated shavings that fall below); *give* and *do someone the favor of *(← hand ← hand down); *obtain* (← be handed/given); and *latter half* (← bottom/lower of two halves).

[Full Kanji Etymology List]