noun
sideline
SYD-lyn
noun
1
The line marking the side boundary of a sports field, or the area just outside it.
"The coach shouted instructions from the sideline."
2
An additional activity or source of income separate from someone's main job.
"She runs a jewellery business as a sideline."
verb
1
To exclude someone from participation or from the main focus of attention.
"An ankle injury sidelined him for the rest of the season."
How to Use Sideline
Learner’s notesIn plain EnglishThe edge of a playing field, a secondary activity, or to be kept out of the main action.
Common pairings
on the sidelines
sidelined by injury
a profitable sideline
Word Forms
sidelined past tense, sidelines plural, sidelines singular
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The coach shouted instructions from the _____.
Etymology
A compound of "side" and "line".