do (one's) duty

(redirected from do their duty)

do (one's) duty

1. To do, undertake, or accomplish that which is expected or required from one. I know it isn't easy facing off against the lowlifes of this town, but you're on the police force and you have to do your duty.
2. To urinate or defecate, especially a house pet. I hate standing out here in the cold, waiting for the dog to do his duty.
See also: duty
References in classic literature ?
I know they will remember all I said to them, that they will be loving children to you, will do their duty faithfully, fight their bosom enemies bravely, and conquer themselves so beautifully that when I come back to them I may be fonder and prouder than ever of my little women.