敖
ゴウ, あそ.ぶ, おご.る

play, be proud

JLPT0 G13 S0 F5000

The relevant seal inscription form shows that the 土 element was originally 出 proceed. 敖 adds 放 # scatter → spread/roam without restraint → *ramble*; *play around*. *Arrogant* is a borrowed meaning, via 傲.

[Full Kanji Etymology List]