Secret or underhand mischief; a veiled rebuke; a bad deed probed by disguised means. To mich or meech means to skulk or shrink from sight. Michers are poachers or secret pilferers. Malicho is a Spanish word meaning an “evil action;” as a personified name it means a malefactor. (Hamlet, iii. 2.)
The “quarto” reads munching mallico; the “folio” has miching malicho. Qy. The Spanish mucho malhecho (much mischief)?
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894