do bit

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do a/(one's) bit

1. To do a small amount of something. In this usage, "a" is used between "do" and "bit." I was only able to do a bit of cleaning before your mother called—that's why the dirty dishes are still on the table.
2. To contribute work to that of others in a group. In this usage, a noun or pronoun is used between "do" and "bit." If you don't do your bit with the slides, our presentation will never be finished on time.
See also: bit

do (one's) bit

To make an individual contribution toward an overall effort.
See also: bit