1. muck up soil with mud, muck, or mire
  2. mock up construct a model of
  3. mock-up full-scale working model of something built for study or testing or display
  4. muckheap a heap of dung or refuse
  5. makeup the way in which someone or something is composed
  6. mug up study intensively, as before an exam
  7. make up form or compose
  8. make-up the way in which someone or something is composed
  9. suck up ingratiate oneself to; often with insincere behavior
  10. buck up gain courage
  11. ruck up become wrinkled or drawn together
  12. mark up increase the price of
  13. markup the amount added to the cost to determine the asking price
  14. pick up take and lift upward
  15. back up move backwards from a certain position
  16. backup the act of providing approval and support
  17. magpie long-tailed black-and-white crow that utters a raucous call
  18. macabre shockingly repellent; inspiring horror
  19. make happy celebrate noisily, often indulging in drinking
  20. mucous of or secreting or covered with or resembling mucus