Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun One that remains on the sidelines; a nonparticipant.

from The Century Dictionary.

  • noun A sidewinder, sidewiper, or massasauga.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun One who stays on the sidelines; a spectator or nonparticipant.
  • noun US A beekeeper, neither a hobbyist nor a fully-fledged commercial operator, for whom beekeeping is a secondary source of income.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

sideline +‎ -er

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