1.
a. To subject or allow to be subjected to an action, influence, or condition: exposed themselves to disease; exposed their children to classical music.
b. To subject (a photographic film, for example) to the action of light.
c. To deprive of shelter or protection; lay open to danger or harm: troops that were exposed to gunfire.
2. To make visible: Cleaning exposed the grain of the wood. See Synonyms at show.
3.
a. To make known (something discreditable).
b. To reveal the guilt or wrongdoing of: expose a criminal.
4. To engage in indecent exposure of (oneself).                                                    [Middle English exposen, from Old French exposer, alteration (influenced by poser, to put, place) of Latin expnere, to set forth; see expound.]

 thanks a lot