1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Hum  \Hum\,  v.  i.  [imp.  &  p.  p.  {Hummed};  p.  pr  &  vb  n. 
  {Humming}.]  [Of  imitative  origin;  cf  G.  hummen,  D.  hommelen 
  [root]15.] 
  1.  To  make  a  low  prolonged  sound,  like  that  of  a  bee  in 
  flight;  to  drone;  to  murmur;  to  buzz;  as  a  top  hums.  --P. 
  Fletcher. 
 
  Still  humming  on  their  drowsy  course  they  keep 
  --Pope. 
 
  2.  To  make  a  nasal  sound,  like  that  of  the  letter  m 
  prolonged,  without  opening  the  mouth,  or  articulating;  to 
  mumble  in  monotonous  undertone;  to  drone. 
 
  The  cloudy  messenger  turns  me  his  back  And  hums. 
  --Shak. 
 
  3.  [Cf.  {Hum},  interj.]  To  make  an  inarticulate  sound,  like 
  h'm,  through  the  nose  in  the  process  of  speaking,  from 
  embarrassment  or  a  affectation;  to  hem. 
 
  4.  To  express  satisfaction  by  a  humming  noise. 
 
  Here  the  spectators  hummed.  --Trial  of  the 
  Regicides. 
 
  Note:  Formerly  the  habit  of  audiences  was  to  express 
  gratification  by  humming  and  displeasure  by  hissing. 
 
  5.  To  have  the  sensation  of  a  humming  noise;  as  my  head 
  hums,  --  a  pathological  condition. 

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