とばす
to fly, to launch in the air
You put the thing into the air rather than going up yourself. The same to-boot とば as 飛ぶ, except this time somebody threw it, and the paper plane is on its third lap: とばす.
飛ぶ とぶ is a thing flying. 飛ばす is you sending it up.
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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.