noun A light fitted to the side of something, such as a car.
- If it starts getting misty, put your sidelights on.
noun A small extra fact that helps explain something.
- He is well up to form when dealing with passenger stock, notably Victorian and Edwardian and on this and on East Coast motive power he throws many sidelights.
— , New Reading on Railways: The Flying Scotsman 1862-1962. By C. Hamilton Ellis. Allen & Unwin. 6s (1962)
- A book of this type is necessarily mainly factual, but it is diversified by many incidents and sidelights which help to give life to a story now accorded its due place in railway history.
— , Railway Literature: Southern Electric. By G. T. Moody (1957)
