ひろげる
to spread, to unfold
You take the folded thing and make it wide, elbows out to either side. Not on a train, hero ひろ: ひろげる.
広がる ひろがる is a thing spreading on its own. 広げる is you opening it out.
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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.