Webster's English Dictionary

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reinforce

re.in.force \.re--*n-'fo-(*)rs, -'fo.(*)rs\ vb [re- + inforce, alter. of 
   enforce] 1: to strengthen by additional assistance, material, or support  
   2a: to strengthen with additional forces  2b: to strengthen or increase by 
   fresh additions  : to seek or get reinforcements  - re.in.forc.er n