do one's bit

present singular third person does one's bit · participle present doing one's bit · past did one's bit · participle past done one's bit

1. informalTo make an individual contribution toward an overall effort.

   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.

   September 8 2022, Stephen Bates, “Queen Elizabeth II obituary”, in The Guardian

   1 more example

   Soon we were climbing through New Mills and Foxhall, both of which are closed entirely, their buildings doing their bit to ease the housing problem, and Kilmacrenan was reached at four o'clock.

   1949 November and December, K. Longbottom, “By Goods Train to Gweedore”, in Railway Magazine, page 355

   Synonyms: do one's part, do one's fair share