Drink — assimilate (6)
I believe the answer is:
imbibe
I believe this is a double definition.
'drink' is the first definition.
(synonyms)
'assimilate' is the second definition.
(I know that assimilate can be written as imbibe)
(Other definitions for imbibe that I've seen before include "Take in (with one's mother's milk?)" , "Tope" , "Drink (alcohol)" , "Swallow" , "Drink, take in" .)