phrasal verb → muck If someone mucks in, they join in with an activity or help other people with a job and do not consider themselves to be too important to do it. [mainly British, informal]
[V P] ⇒ Course residents are expected to muck in and be prepared to share rooms.
[V P + with] ⇒ She mucked in with the chores and did her own washing and ironing.
[V P with n] ⇒ Ian was never afraid to take his coat off and muck in with everybody else. [Also V P together]
COBUILD Advanced English Dictionary. Copyright © HarperCollins Publishers