Webster's English Dictionary

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impugn

Cross references:
  1. deny                  
 
im.pugn \im-'pyu:n\ vt [ME impugnen, fr. MF impugner, fr. L inpugnare, fr. 
   in-] + pugnare to fight - more at PUGNACIOUS obs  1a: ASSAIL  1b: RESIST  
   2: to assail by words or arguments : oppose or attack as false  - 
   im.pugn.er n