bù不notyí遗leaveyú余remaininglì力strength
To spare no effort; to do one's utmost.
Literal meaning
not (不) — leave (遗) — remaining (余) — strength (力)
Origin
A classical four-character phrase, describing the act of putting all one's effort into something.
Examples
wèi为le了wán完chéng成rèn任wu务，tā他bù不yí遗yú余lì力de地gōng工zuò作。
In order to complete the task, he worked with all his might.
xué学xiào校bù不yí遗yú余lì力de地zhī支chí持xué学shēng生de的chuàng创xīn新huó活dòng动。
The school spares no effort to support students' innovative activities.
Usage & nuances
Used to emphasize the dedication and effort put into a task.
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