sidelight
Noun
Meaning
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
Source: WordNetSynonyms
running light
lantern
light
account
bulletin
datum
communication
announcement
lamp
directory
dispatch
acquaintance
headlight
floodlight
info
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Antonyms
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Examples
As a sidelight, the issue came up after a merchant questioned a city utility employee about wasting gas by parking a city pickup with the motor running while doing work.
But competition is a sidelight for him, a distraction from his real passion: tying on his Brooks running shoes and getting in the road alone, day after day, week after week.