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Sports A line along either of the two sides of a playing court or field, marking its limits.
(noun)
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Sports The space outside such limits, occupied by coaches, inactive players, and spectators.
(noun)
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The position or point of view of those who observe rather than participate in an activity: the political sidelines.
(noun)
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A subsidiary line of merchandise.
(noun)
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An activity pursued in addition to one's regular occupation.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.