common as muck

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common as muck (not comparable)

1. (simile) Very common (in various senses).
   • 2011, David McWilliams, The Pope's Children, page 52:

     How many times have you heard a young mother roll her eyes up to heaven at the sound of another mum calling out the name of her child, only to realize that the name she picked is now common as muck?

• common as pig tracks
• common as bums (Australia, colloquial)