[英中] keep/lift knuckles off the ground

[nohbdy (uma)]

請問各位，這是什麼意思？
Keep/lift/get one's knuckles off the ground

google了一小時，還是找不到答案，只好上來求譯
找到一個例子，但感覺不太有幫助

"Spooks: Episode #5.3" (2006)
Zafar Younis: Where's Jo?
Ros: Death by mascara. It was horrible to watch.
Ruth's agonizing over the fact that there are no more horses
in modern-day warfare and Adam's on a course learning
how to "lift his knuckles off the ground."
So, you'll have to make do with me, I'm afraid.
Zafar Younis: Shouldn't you be in prison or something?
Ros: This is the something.

因為這個詞好像是一句俚語
請問有人知道它大概的意思嗎？

謝謝解惑！

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→ nohbdy:發現版規還需附上臆測的譯文
→ nohbdy:但真的很難猜...knuckles是指節
→ nohbdy:keep off the ground 是使不落到地面上
→ nohbdy:所以是...不讓指節落地--> 不輕舉妄動？不大驚小怪？
→ nohbdy:sorry...我盡力了...
→ chingfen:可以到eng-class問
推 tengharold:禮節/文化課
→ usread:形容其懶,教他戒懶
→ usread:google 時不能"死找",要善用 wild character
推 spacedunce5:learn something new every day!
推 Quasimodo:                      every minute! XD
→ tengharold:我以為是要他別再當 knuckle dragger
推 l10nel:的確是 knuckle dragger，猿類走路時指節觸地，"keep your
→ l10nel:knuckles off the ground" 可找到不少例子，都在罵人笨、
→ l10nel:罵人低能，是很粗魯的說法。Urban Dictionary和Wiktionary
→ l10nel:定義knuckle dragger為笨。其他如罵人懶或無禮，不無可能，
→ l10nel:大家一起找找。