American English

Definition of sideline noun from the Oxford Advanced American Dictionary



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  1. 1[countable] an activity that you do as well as your main job in order to earn extra money His hobby of winemaking was fast becoming a profitable sideline.
  2. 2sidelines [plural] the lines along the two long sides of a sports field, tennis court, etc. that mark the outer edges; the area just outside these The coach stood on the sidelines yelling instructions to the players.
  3. Idioms
    on/from the sidelines
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    watching something but not actually involved in it He was content to watch from the sidelines as his wife built up a successful business empire. She has chosen to remain on the sidelines of public debate.
See the Oxford Advanced Learner's Dictionary entry: sideline

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