外
ガイ, ゲ, そと, ほか, はず.す, はず.れる, と, うい, け, ふか

outside

JLPT5 G2 S5 F81

夕 here a variant form# of 月 (crescent) moon + 卜 divination → cast horoscopes on the basis of the invisible *outside* portion of the moon (compare 朏) → *other* → *some/any other place*; *somebody else*; *others*; *besides*. The sense of "the part other than the portion scooped out" leads to extended meanings such as *take off*; *be/come off*; *remove*; *undo*; *take leave*; *evade*; *edge* and *outskirts* → *miss* (the mark); *be wrong*; *failure* → *violate*.

[Full Kanji Etymology List]