To subject or allow to be subjected to an action, influence, or condition: exposed themselves to disease; exposed their children to classical music. To subject (a photographic film, for example) to the action of light. To deprive of shelter or protection; lay open to danger or harm: troops that were exposed to gunfire. To make visible: Cleaning exposed the grain of the wood. See Synonyms at show. To make known (something discreditable). To reveal the guilt or wrongdoing of: expose a criminal. To engage in indecent exposure of (oneself).