Webster's English Dictionary

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misuse

1. mis.use \mish-'u:z, (')mis(h)-'yu:z\ vt [ME misusen, partly fr. mis- + 
   usen to use; partly fr. MF ]mesuser to abuse, fr. OF, fr. mis- + user to 
   use 1: to use incorrectly : MISAPPLY  2: ABUSE, MISTREAT 
2. mis.use \mish-'u:s, (')mis(h)-'yu:s\ n : incorrect or improper use : 
   MISAPPLICATION