to make or become (something) larger
to reproduce (something) in a larger form, esp by making a photographic enlargement
to grow larger
(often + on/upon) to speak or write at length; to elaborate
The truth is not wonderful enough to suit the newspapers; so they enlarge upon it and invent ridiculous embellishments — Annie Sullivan
enlarger noun
[Middle English enlargen from Old French enlargier, from en-1 + large: see large1]