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English definition of “sideline”

sideline

noun [C]     /ˈsaɪdlaɪn/
a business activity that someone does in addition to their main business: For many companies, producing own-label goods is not a sideline, it's a strategy for growth.a sideline in sth The company has been developing a sideline in closed-circuit television since buying the electronics business last year.
on the sidelines not being used or not involved in an activity: The absence of new products is keeping consumers on the sidelines. stay/wait/sit on the sidelines
(Definition of sideline noun from the Cambridge Business English Dictionary © Cambridge University Press)
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