Longman Dictionary of Contemporary English homepage

sideline

1 noun
     
Related topics: Sport
sideā€§line1
1 [countable] an activity that you do as well as your main job or business, in order to earn more money
as a sideline
Zoe does a bit of freelance photography as a sideline.
2

on the sidelines

not taking part in an activity even though you want to or should do
stand/stay/remain etc on the sidelines
You can't stay on the sidelines for ever; it's time you got involved.
3

sidelines

[plural]DS the area just outside the lines that form the edge of a sports field
on the sidelines
Wenger stood on the sidelines shouting instructions.
4 [countable]DS a line at the side of a sports field, which shows where the players are allowed to play

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