遂 means “accomplish, carry out”

とげる · togeru

Also: consummate, attain, commit (suicide)

Kun'yomi (Japanese reading)
とげる, ついに
On'yomi (Chinese reading)
スイ

JLPT N1 · Taught in secondary school · 12 strokes

The story

A wild boar (豕) charging all the way down the road (辶): seeing a thing through to the end. 成し遂げる is to achieve, 遂行 is carrying out a mission, and in crime reports 未遂, not yet accomplished, marks an attempt that failed.

Used in 遂げる (togeru, to accomplish), 遂行 (suikou, carrying out), and 未遂 (misui, attempted, of a crime)

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