テイ, し.まる, し.まり, し.める, し.め, じ.め

tighten, tie, shut, lock, fasten

JLPT1 G7 S15 F797

As per # (unify) + thread → *bind* objects with thread → *tie*; *tighten*; *close*; *shut*; *fasten*; *turn off* → *firm*; *solid*; *control strictly*; *straighten (oneself) out* → *economize*; *be thrifty*.

[Full Kanji Etymology List]