sidelight

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun light carried by a boat that indicates the boat's direction; vessels at night carry a red light on the port bow and a green light on the starboard bow

From side + light.

'Huxtable's Sidelights on Horace' may possibly recall my name to your memories. — The Return of Sherlock Holmes, Arthur Conan Doyle
The captain’s steam-cutter was already afloat, and her sailors busy with sidelights and engines. — The Riddle of the Sands, Erskine Childers
As he spoke, the gleam of the sidelights of a carriage came round the curve of the avenue. — The Lock and Key Library: Classic Mystery and Detective Stories: Modern English, Unknown

running light

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