verb (used with object), un·der·ex·posed, un·der·ex·pos·ing.
to expose either to insufficient light or to sufficient light for too short a period, as in photography.
Origin of underexpose
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
photog to expose (a film, plate, or paper) for too short a period or with insufficient light so as not to produce the required effect
(often passive) to fail to subject to appropriate or expected publicity
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