vt 1 a  :  to cause or undergo the growth, strengthening, or enlargement of <ed their muscles by weight lifting>   b  :  to cause to grow and differentiate along lines natural to its kind <the zygote is gradually ed into the adult plant or animal>   2  :  to have (something) unfold or differentiate within one - used esp. of diseases and abnormalities <too many children ed tuberculosis>  vi  1  :  to go through a process of natural growth, differentiation, or evolution by successive stages <the fever s normally>  <the embryo s into a well-formed human being>   2  :  to acquire secondary sex characteristics <she is ing rapidly for a girl of 12>  .
 
 
 
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