the GNU version of the Collaborative International Dictionary of English
n. One who exposes or discloses.
The Century Dictionary and Cyclopedia
n. One who exposes, uncovers, lays bare, etc.: as, an exposer of fraud.
Word Usage
"- Whittaker Chambers (born Vivian Jay Chambers in 1901, Soviet agent turned right wing Christian activist, and exposer of Soviet agent, trusted aide to FDR, and UN co-architect, Alger Hiss), 1952 0"