伸 means “stretch, grow, extend”

のびる · nobiru

Also: expand, lengthen

Kun'yomi (Japanese reading)
のびる, のばす, のべる, のす
On'yomi (Chinese reading)
シン

JLPT N2 · Taught in secondary school · 7 strokes

The story

A person (亻) beside 申, drawn from a branching bolt of lightning: picture someone stretching to full length. 伸びる is to grow or stretch, as hair, children and sales all do, 伸ばす is to stretch something out, and 背伸び is rising on tiptoe.

Used in 伸びる (nobiru, to stretch/grow), 伸ばす (nobasu, to lengthen/extend), and 背伸び (senobi, standing on tiptoe)

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