のばす
to stretch, to straighten
You draw the thing out longer than it was, and before a run it is your own legs. No bus のばす coming, so you stretch and walk it: のばす.
伸びる のびる is a thing stretching or growing by itself. 伸ばす is you stretching it.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.