D defs.my
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Entry 6 senses · 2 variants Webster, 1913

Sideline

· IPA /ˈsaɪdlaɪn/
01 n. A line pertaining or attached to the side of a thing.
  1. 1.
    A line pertaining or attached to the side of a thing.
  2. 2.
    A line of goods sold in addition to one's principal articles of trade; a course of business pursued aside from one's regular occupation.
  3. 3.
    A secondary road; esp., a byroad at right angles to a main road.[Canada]
  4. 4.
    Either of two marked lines which delimit the side boundaries of a playing field, as in football or soccer.(Sports)
  5. 5.
    The areas in a sports arena just beyond the sidelines{4}, where coaches and alternative players sit or stand.(Sports) [plural]
Phrases & compounds
on the sidelines — not actively involved in an activity, such as a sporting event, but available for use when needed; in reserve; as, the coach kept him on the sidelines for a week.
02 v. t. To render unable to participate in an activity, such as a sporting event; as, the pitcher was sidelined by a groin injury.
  1. 1.
    To render unable to participate in an activity, such as a sporting event; as, the pitcher was sidelined by a groin injury.