vt 1  :  to make known or exhibit by an expression  2 a  :  to force out by pressure <women who work outside the home can and store breast milk -J. Raloff>   b  :  to subject to pressure so as to extract something <some pumps one breast at a time -Paula Lynn Parks>   3  :  to cause (a gene) to manifest its effects in the phenotype .
 
   
 
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