Wiktionary
mucks in
vb. (en-third-person singular of: muck in)
Usage examples of "mucks in".
Lord Kendale, one of the very great muckety-mucks in the Ministry of Defense, wouldn't hesitate to call in favors from companion services to protect his only daughter.
This is some kind of private deal for the high mucky-mucks in the faculty.
This business I hear about the people in Suhl selling guns outside the CPE is bound to make some of the big mucky-mucks in the government look to other places to buy guns.