What is "pull one's weight"

alt. (context idiomatic English) To contribute fairly and proportionately to a group effort; to do the work that one is obligated to. vb. (context idiomatic English) To contribute fairly and proportionately to a group effort; to do the work that one is obligated to.

v. do one's share in a common task; "Bob has never pulled his weight, and we all have to work harder to make up for his laziness"