Webster's English Dictionary

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overwhelm

over.whelm \-'hwelm, -'welm\ \-'hwel-min-le-, -'wel-\ vt [ME overwhelmen, 
   fr. 1over + whelmen to turn over, cove]r up 1: OVERTHROW, UPSET  2a: to 
   cover over completely : SUBMERGE  2b: to overcome by superior force or 
   numbers : CRUSH  - over.whelm.ing.ly av