an activity done in addition to one's main job, especially to earn extra income
（尤指挣取外快的）副业，兼职
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[as modifier]
a sideline career as a stand-up comic .一份做单人说笑喜剧演员的兼职工作。
an auxiliary line of goods or trade
兼售的货类；附带的贸易
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electronic handbooks are a lucrative sideline for the firm .电子手册是这家公司赚钱的附带商品。
(一般作
（足球场、篮球场等的）边线。
the area immediately outside such lines as a place for non-players, substitutes, or spectators
（供非运动员、替补队员或观众坐的）场外区域。
cause (a player) to be unable to play in a team or game
使（运动员）无法参赛
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an ankle injury has sidelined him for two weeks .踝部受伤已迫使他停赛两周。
〈喻〉 使靠边；使降格
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back-bench MPs have been sidelined and excluded from decision-making .后座议员已经靠边站，无权参与决策。
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on （或from ）the sidelines in （or from） a position where one is observing a situation but is unable or unwilling to be directly involved in it 当旁观者，当局外人
