IDIOM ►

sidelined

Meaning 1
to be taken out of the game / to be injured
Sentence 1
He was sidelined because of a knee injury.
Meaning 2
to stop working on something
Sentence 2
We better sideline that project.

Derivation

The lines of the playing field show where the game is to be played. Players within the lines or boundaries are playing the game. Those outside the boundaries are not playing or sidelined.