verb
-pands; -panded; -panding
[no obj] :to increase in size, range, or amount :to become bigger
[+ obj] :to cause (something) to increase in size, range, or amount :to make (something) bigger
[+ obj] :to write (something) in full form
expand on/upon
[phrasal verb]
expand on/upon (something) :to speak or write about (something) in a more complete or detailed way