to do one's share of the work; to do whatever one can do to help.
All people everywhere must do their part to help get things under control.I always try to do my bit. How can I help this time?
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do (one's) part
To contribute work to that of others in a group. If you don't do your part with the slides, our presentation will never be finished on time.We haven't asked you to do anything extra. Just do your part.