verb (used with object)
to develop (something) short of the required amount: to underdevelop film.
Origin of underdevelop
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
(tr) photog to process (a film, plate, or paper) in developer for less than the required time, or at too low a temperature, or in an exhausted solution
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012