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Male antler flies do the same, except they use their antlers to head-butt each other—to see off rivals.

雄性鹿角蝇也做同样的事情，只不过它们用鹿角互相头撞头——以赶走竞争对手。

youdao

It means that you're willing to work your butt off to achieve the company's goals.

这就意味着，为了达到公司的目的，你要自愿放弃自己的目标。

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Two years out of college and working her butt off in the start-up world, something was missing.

FORBES: 15 Ways to Tell If You're on the Right Path

But it is my hope and prayer that Congress gets off its self-centric butt and makes Qualified Charitable Distributions a permanent part of our tax code. (Can you hear the crickets chirping?) This would allow the charitably inclined and qualified charitable organizations to make predictable plans to pursue their worthy missions, tax free.

FORBES: Congress Ends Punishment Of Charities And Retirees...For Now

Players try to seek refuge during the off-season, but the butt dialer finds them.

WSJ: The King of the Accidental Phone Call