Definition of sidelight noun from the Oxford Advanced American Dictionary

 

sidelight

 noun
noun
NAmE//ˈsaɪdlaɪt//
 
sidelight (on somebody/something)
 
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a piece of information, usually given by accident or in connection with another subject, that helps you to understand someone or something The article gives us a few interesting sidelights on life in Japan in general.
See the Oxford Advanced Learner's Dictionary entry: sidelight