n.[C]

1. 旁線；橫線；側道
2. 副職，兼職；副業
   Joe is an engineer, but he does some translation as a sideline.

   喬是工程師，但作為副業他也從事一些翻譯。

3. （球場等的）界線；界線外（觀眾觀看）的場地[P1]
   They watched the match from the sidelines.

   他們站在界線外看比賽。

4. 局外人的觀點[P1]

v.

1. 使退出比賽；使下場
   The football player has been sidelined by a foot injury.

   那名足球選手因腳部受傷而退出比賽。

2. 使靠邊；使邊緣化

n.

1. an activity done in addition to one's main job.
2. either of the two lines bounding the longer sides of a football field, basketball court, or similar.
3. (the sidelines) a position of observing a situation rather than being directly involved in it.

v.