Webster's English Dictionary

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swear

swear \'swa(*)r, 'swe(*)r\ \'swo-(*)r, 'swo.(*)r\ \'swo-(*)rn, 'swo.(*)rn\ 
   vb or swore;  or sworn or swear.ing [ME sweren, fr. OE swerian; akin to OHG 
   swerien to swear, Rus]s svara altercation 1: to utter to take solemnly (an 
   oath)  2a: to assert as true or promise under oath  2b: to assert or 
   promise emphatically or earnestly  3a: to put to an oath : administer an 
   oath to  3b: to bind by an oath  obs  4: to invoke the name of (a sacred 
   being) in an oath  5: to bring into a specified state by swearing {swore 
   his life awa y} 1: to take an oath  2: to use profane or obscene language : 
   CURSE  1: to take an oath by {swear by Apollo}  2: to be sure of the 
   existence of : be barely positive of - used in the  phrase enough to swear 
   by 3: to place great confidence in  : to answer for : GUARANTEE  : to vow 
   to abstain from : RENOUNCE  - swear.er n