reveal of how a trick is done;  disclosure of a secret (cause, source, etc.);  exposure;  explanation
 staying up all night;  all-night vigil
 reveal of how a trick is done;  disclosure of a secret (cause, source, etc.);  exposure;  explanation
 hired thief taker (Edo-period);  private detective;  private secret policeman
 lighted lamp (or candle, etc.) provided as a religious offering