Definition of mixen in US English:

mixen

noun

British Regional
  • A place where dung and refuse are put; a dunghill, a midden; a heap of dung, compost, etc., used for manure.

Origin

Old English. From mix [adjective] + -en. Compare the similar formation Old High German dunghill mistun (Middle High German misten, early modern German misten).

Pronunciation

mixen

/ˈmɪks(ə)n/