sideline

1 sideline /ˈsaɪdˌlaɪn/ noun
plural sidelines
1 sideline
/ˈsaɪdˌlaɪn/
noun
plural sidelines
Britannica Dictionary definition of SIDELINE
[count]
1 
a  : a line that marks the outside edge of a sports field or court
b  : the space outside the area where a game is played on a field or court — usually plural
— often used figuratively
2 
: a job that is done in addition to your main job
2 sideline /ˈsaɪdˌlaɪn/ verb
sidelines; sidelined; sidelining
2 sideline
/ˈsaɪdˌlaɪn/
verb
sidelines; sidelined; sidelining
Britannica Dictionary definition of SIDELINE
[+ object]
: to prevent (a player) from playing in a game especially because of injury, illness, etc. — usually used as (be) sidelined — often used figuratively