投 means “throw, cast”

なげる · nageru

Also: discard, abandon, launch into

Kun'yomi (Japanese reading)
なげる
On'yomi (Chinese reading)
トウ

JLPT N3 · Taught in grade 3 · 7 strokes

The story

A hand (扌) beside a hand swinging a club (殳): the whole arm thrown into motion. 投げる is to throw, a baseball pitcher is a 投手, and on election day you cast your 投票, a vote dropped into the box.

Used in 投げる (nageru, to throw), 投票 (touhyou, voting), and 投手 (toushu, pitcher)

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