sideline
side + line
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noun
1. an activity done in addition to one's main job, especially to earn extra income:
副業, サイドビジネス
e.g. as modifier : a sideline career as a stand-up comic.
an auxiliary line of goods or business:
(商店の)専門外取り扱い品
e.g. electronic handbooks are a lucrative sideline for the firm.
2. (usually sidelines) either of the two lines bounding the longer sides of a football field, basketball court, tennis court, or similar playing area.
(競技のフィールドコートの)側線, サイドライン
the area immediately outside either sideline as a place for nonplayers, substitutes, or spectators:
〖～s〗 サイドラインの外側〘控え選手などの位置〙
e.g. his son watched from the sidelines. See also on the sidelines below.
verb with object
cause (a player) to be unable to play in a team or game:
(けがなどで)出場メンバーからはずされる
e.g. he has been sidelined for the last six weeks with a fractured wrist.
remove from the center of activity or attention; place in a less influential position:
(重要なポストから)はずされる, 脇に追いやられる.
e.g. a respected lawyer will be sidelined by alcohol abuse.
PHRASES
on the sidelines (or 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.