British Slang: Muck in With

To Muck in With Someone:

Share accommodation with someone, share pleasures, etc. with someone, get involved or join in with someone.

Examples:

She really enjoys mucking in with the lads

Definition from the English-Bulgarian dictionary:

Muck [mʌk]:

• Animal manure.
• informal Dirt, rubbish (also figurative), something nasty/unpleasant, disorder.
• Slander.
• Mud.
• Amer.min. Excavated soil, blasted rock.
• Manure, fertilize.
• Soil, stain, dirty, soil.
• Amer.min. Clear rock.
• Clean, remove manure/rubbish.

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