Webster's English Dictionary

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foist

foist \'fo.ist\ vt [prob. fr. obs. D vuisten to take into one's hand, fr. 
   MD vuysten,]fr. vuyst fist; akin to OE fy-st fist 1a: to introduce or 
   insert surreptitiously or without warrant  1b: to force another to accept 
   esp. by stealth or deceit  2: to pass off as genuine or worthy