2. a place for people who are not involved in something, or the condition of being uninvolved (informal) You can always get opinions on any subject from the sidelines.
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edit[1] Luckily, black-market smartphones were easy to come by: Luna had a sideline in smuggling them into the facility.
sense 2? 6?
—Fish bowl (talk) 00:09, 10 June 2022 (UTC)