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Difference between Do a bit and Do one’s bit

do a bit

1. perform a small part in a play or movie:

  • I got to do a bit with Mick Jagger where he comes into a dressing room and looks in the mirror….

2. practice smth. in a small way:

  • In my spare time I always want to do something “creative,” so I choose to do a bit of carpentering.

do one’s bit—

1. fulfill one’s responsibilities or obligations:

  • During the epidemic he did his bit with the other physicians, attending cases night and day.

2. make one’s contribution to the war effort (serving in the armed forces, etc.):

  • Yes we did our bit, as you folks say. I’ll tell the world we got the enemy on the run.