common as muck


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as common as muck

Low-class. Primarily heard in UK, Australia. Considering she's wearing an outfit like that in public, she must be as common as muck.
See also: common, muck

common as muck

BRITISH, OFFENSIVE
If you say that someone is as common as muck, you mean that they are lower-class and not sophisticated. Leary guessed correctly that his guests were as common as muck and planned the menu accordingly.
See also: common, muck