締 means “tighten, fasten, close”

しめる · shimeru

Also: tie, shut, lock

Kun'yomi (Japanese reading)
しまる, しまり, しめる
On'yomi (Chinese reading)
テイ

JLPT N1 · Taught in secondary school · 15 strokes

The story

Thread (糸) pulled tight by an emperor (帝): picture a royal sash cinched hard. 締める is to tighten, from a necktie to a seatbelt, 締め切り is the deadline, and a 取締役 is a company director, the one who keeps a tight rein.

Used in 締め切り (shimekiri, deadline), 締める (shimeru, to tighten/fasten), and 取締役 (torishimariyaku, company director)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.