失 means “lose, mistake”

しつ · shitsu

Also: error, fault, disadvantage

Kun'yomi (Japanese reading)
うしなう, うせる
On'yomi (Chinese reading)
シツ

JLPT N3 · Taught in grade 4 · 5 strokes

The story

A hand (手) with something slipping out between the fingers: losing your grip. 失礼します, literally "I lose my manners", is said on entering or leaving an office, and 失敗 is a failure.

Used in 失礼 (shitsurei, rudeness/excuse me), 失敗 (shippai, failure), and 失う (ushinau, to lose)

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