worker bee
US /ˈwɜːr.kər biː/
UK /ˈwɜːr.kər biː/
1.
a female bee that is not fertile and performs all the duties of the colony
:
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The worker bee diligently collected nectar from the flowers.
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A single worker bee can visit thousands of flowers in a day.
2.
a person who works very hard, especially one who does most of the work in a group or organization
:
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She's the real worker bee of the team, always putting in extra hours.
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In any large organization, you'll find a few worker bees who keep everything running smoothly.