結
ケツ, ケチ, むす.ぶ, ゆ.う, ゆ.わえる, ゆい, ゆう
tie, bind, contract, join, organize, do up hair, fasten
JLPT1 G4 S12 F162
As per 吉# (reduce/eliminate space) + 糸 thread → use thread or a cord to *bind/tie* and thus compact an object → *join*; *make/conclude* (a contract/treaty etc.) → *end*; *wind up* (← finish binding/joining).
[Full Kanji Etymology List]