Webster's English Dictionary

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thicken

thick.en \'thik-*n\ \-(*-)nin\ \-(*-)n*r\ vb or thick.en.ing 1a: to make 
   thick, dense, or viscous in consistency  1b: to make close or compact  2: 
   to add to the depth or diameter of  3: to make inarticulate : BLUR {alcohol 
   ~ed his spee ch} 1a: to become dense {the mist ~ed}  1b: to become 
   concentrated in numbers, mass, or frequency  2: to grow blurred or obscure  
   3: to grow broader or bulkier  4: to grow complicated or keen {the plot ~s} 
    - thick.en.er n