pull (one's) own weight

To contribute to a group activity or project in proportion to one's abilities or role. If you don't pull your own weight, our presentation will never be finished on time.

pull one's (own) weight, to

To do one’s share of the work. This term comes from rowing, where each member of a crew must pull on an oar at least hard enough to propel his or her own weight. The term was used figuratively from about 1900 on. In a 1902 speech, Theodore Roosevelt said, “The first requisite of a good citizen . . . is that he shall be able and willing to pull his weight.”