do one's bit

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do one's bit (third-person singular simple present does one's bit, present participle doing one's bit, simple past did one's bit, past participle done one's bit)

1. (informal) To make an individual contribution toward an overall effort.
   • September 8 2022, Stephen Bates, “Queen Elizabeth II obituary”, in The Guardian‎:

     Elizabeth was said to be slow to mature, but she and her sister did their bit by digging vegetable plots and knitting garments for the troops.

• carry one's weight