verb, noun · to bend the body forward as a sign of respect or to perform a task

他躬身行礼，向来宾表示欢迎。

noun, idiom · the human body, especially the torso in a literary context

那位老教授对待学术事必躬亲，从不马虎应付。

verb · doing something by oneself or in person

纸上得来终觉浅，绝知此事要躬行。