side line

Noun

sideline (plural sidelines)

1. A line at the side of something.
   • Like most other fishes, the dragonet varies slightly in colour in different individuals, and at different seasons of the year. Mr. Pennant describes the pupils of the eyes to be of a rich sapphirine blue; the irides fine fiery carbuncle; the pectoral fins light brown; the side-line straight; the...1809, William Nicholson, “CALLIONYMUS”, in The British Encyclopedia, or Dictionary of Arts and Sciences; […], volume II (B … E), London: Printed by C[harles] Whittingham, […]; for Longman, Hurst...
2. Something that is additional or extra or that exists around the edges or margins of a main item.
   • She started the business as a sideline to her regular work and it ended up becoming the greater source of income.
3. A line for hobbling an animal by connecting the fore and the hind feet of the same side.
4. A line defining the side boundary of a playing field. Used in Canadian football, field lacrosse and basketball.

   Synonyms:

   touchline

5. (plural-normally) The area outside the playing field beyond each sideline.
   • The coach stood on the sidelines and bellowed commands at the team.
6. (figuratively) The outside or perimeter of any activity.
   • to relegate to the sidelines

See all 10 meanings of sideline