Muck In:
Share work / task (with someone)
Examples:
But it's not without its charms, and I'm sure you'll enjoy the camaraderie of not being stuck in your own office.
Camaraderie?
All the staff just...muck in.
Yes, it is rather isolated,..

Meaning from the English-Bulgarian dictionary:
Muck [mʌk]:
- Animal manure.
- informal Dirt, rubbish (also figurative), something nasty/unpleasant, disorder.
- Slander.
- Mud.
- American mining Removed soil, broken rock.
- Manure, fertilize.
- Soil, make dirty, stain, pollute.
- American mining Clear rock.
- Clean up, remove manure/rubbish.
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