Do your bit
Definition 1 of 1
Pro Tip 1/3Team Effort
The phrase often implies that a collective effort is required to achieve something substantial. 
If we all do our bit, we can finish the project on time.
Pro Tip 2/3Community Actions
Used when individuals within a community contribute to a common goal or cause. 
Each volunteer did their bit to organize the charity event.
Pro Tip 3/3Not Always Equal
'Doing your bit' doesn't mean equal effort, but rather contributing in a way that's possible for you. 
She's too young to do heavy lifting, but she did her bit by handing out supplies.