にげだす
to make a break for, to run off
You get away and then you are out and still moving, which is two stages rather than one. The tiger is not in the cage and your knee に is going げ before the rest of you: にげだす.
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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.