[1855–60, Amer.; ‹ Sp: lit., knapsack, deriv. of mochil errand boy ‹ Basque motxil, dim. of motil, mutil boy, servant ‹ L mutilus mutilated (from the custom of shaving boys' heads)]This word is first recorded in the period 1855–60. Other words that entered Englishat around the same time include: boilerplate, kickoff, lavabo, output, pickup