Wiktionary
mucked in
vb. (en-pastmuck in)
Usage examples of "mucked in".
He'd heard that the English all `mucked in', as they put it, but this lot were not the sort who looked as though they'd spend the night in a crypt except as a gag at Halloween.
Elizabeth mucked in as best she could, helping to maneuver the tanks and crates onto the department's flatbed truck parked alongside.
When that happened, you mucked in and made sure everyone got back to base okay.