the literal humiliation of having to crawl between the legs of an adversary, specifically referring to the historical anecdote involving Han Xin

韩信能忍胯下之辱，足以证明他是个胸怀大志的人。

extreme disgrace or public shame that one is forced to endure, often for the sake of a larger goal

他为了保住公司，宁愿忍受这种胯下之辱。