become larger or bigger
"As the balloon filled with helium, it began to enlarge until it nearly touched the ceiling."
To make (something) larger.
"The photographer decided to enlarge the photo so everyone could see the details of the landscape."
In plain English: To enlarge something means to make it bigger.
"The photographer decided to enlarge the photo so everyone could see the details."
Usage: Use enlarge to mean making something physically bigger or increasing its size, such as enlarging a photograph or expanding a room. It describes the action of adding scale or volume rather than just improving quality or quantity.
Enlarge comes from the Middle English word enlargen, which was borrowed from Old French and originally meant "to make larger." Although it looks like a combination of "en-" and "large," this formation is simply how the word evolved rather than a deliberate compound created later.