- (transitive) 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
WordReference Random House Unabridged Dictionary of American English © 2026
un•der•de•vel•op
(un′dər di vel′əp),USA pronunciation v.t.
un′der•de•vel′op•ment, n.
- Photographyto develop (something) short of the required amount:to underdevelop film.
- under- + develop
Collins Concise English Dictionary © HarperCollins Publishers::
underdevelop /ˌʌndədɪˈvɛləp/ vb