en·large 
/ɪnˈlɑɚʤ/ verb
en·larg·es; en·larged; en·larg·ing /ɪnˈlɑɚʤ/ verb : to make (something) larger or to become larger [+ obj] ▪ We had the photograph enlarged. ▪ The company is in the process of enlarging [=expanding] its offices. [no obj] ▪ The glands enlarge [=swell] when you have an infection.
enlarge on/upon [phrasal verb]
enlarge on/upon (something) formal : to give more information about (something)
▪ Would you kindly enlarge [=elaborate] on that point?
▪ Would you kindly enlarge [=elaborate] on that point?
— en·larg·er noun, plural en·larg·ers [count]
▪ a photo enlarger
▪ a photo enlarger
