The following sentence is an excerpt from a video uploaded by the magazine TIME on YouTube, whose title is “TIME Person Of The Year: Joe Biden And Kamala Harris.” The sentence mentioned below focuses on problems about black people.
Part of what I think settles some of these question is to work your behinds off for a more just America.
I do not know the meaning of the phrasal verb “work behinds off”. I had never seen the phrase before and tried to seek any information about it on the Internet, but I couldn’t.
Would you mind telling me the meaning of the phrase?