Source : Webster's Revised Unabridged Dictionary (1913)

Muckle \Muc"kle\, a. [See {Mickle}.]
   Much. [Obs.]

Source : WordNet®

muckle
     n : (often followed by `of') a large number or amount or extent;
         "a batch of letters"; "a deal of trouble"; "a lot of
         money"; "he made a mint on the stock market"; "it must
         have cost plenty" [syn: {batch}, {deal}, {flock}, {good
         deal}, {great deal}, {hatful}, {heap}, {lot}, {mass}, {mess},
          {mickle}, {mint}, {peck}, {pile}, {plenty}, {pot}, {quite
         a little}, {raft}, {sight}, {slew}, {spate}, {stack}, {tidy
         sum}, {wad}, {whole lot}, {whole slew}]