One of the mysteries of the English language finally explained.
1With indefinite object: to do badly, wrongly, unjustly, or improperly.
2To do (work) or perform (a duty) badly or improperly.
3To do evil or wrong to (a person); to harm, injure, wrong. Formerly also: †to sin against (God) (obsolete). Now archaic.
Old English (in an earlier sense). From mis- + do. Compare Old Frisian misduā, Middle Dutch misdoen (Dutch misdoen), Middle Low German misdōn, Old High German missituon (Middle High German missetuon, German † misstun).
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