Jisho

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Noun, Suru verb, Intransitive verb
1. standing on tiptoe and stretching one's back to make oneself taller; stretching oneself​
Noun, Suru verb, Intransitive verb
2. overreaching oneself; overstretching oneself; trying to do something beyond one's ability; pushing to the limit​
Other forms
背伸び 【せいのび】、背延び 【せのび】、背延び 【せいのび】
Notes
背延び: Rarely-used kanji form. 背延び: Rarely-used kanji form.

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