Webster's English Dictionary

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dumb

Cross references:
  1. stupid                
 
1. dumb \'d*m\ \'d*m-le-\ aj [ME, fr. OE; akin to OHG tumb mute, OE de-af 
   deaf - more at MDEAF 1: destitute of the power of speech  2: naturally 
   incapable of speech {~ animals}  3: not expressed in uttered words {~ 
   grief}  4a: not willing to speak  4b: not having the usual accompaniment of 
   speech or sound  5: lacking some usual attribute or accompaniment; esp : 
   having no  means of self-propulsion {~ barge} 6: STUPID, FOOLISH  - dumb.ly 
   av
2. dumb vt : to make silent : DEADEN