sidelight
noun /ˈsaɪdlaɪt/
  /ˈsaɪdlaɪt/
- sidelight (on somebody/something) a piece of information, usually given by accident or in connection with another subject, that helps you to understand somebody/something- The article gives us a few interesting sidelights on life in Japan in general.
 
- (British English) either of a pair of small lights at the front of a vehicle