IPA: /ˌʌndərɪkˈspoʊz/
KK: /ʌndərɪkˈspoʊz/
To give insufficient light or exposure to something, especially in photography, which results in a picture that is too dark or lacks detail.
The photographer decided to underexpose the film to create a moody effect.
Past: underexposed
Past Participle: underexposed
Underexpose → It is formed from "under-" (meaning below or insufficiently) and "expose" (from Latin "exponere", meaning to put out or to reveal). The word refers to revealing something insufficiently or not fully exposing it to light or attention.
Think of something being revealed 'insufficiently' ('under-') — that's why underexpose means to not fully reveal or show.