noun, plural look·ers-on.
Origin of looker-on
Examples from the Web for looker-on
It was Corp who had done it, and Tommy had been the looker-on.Tommy and Grizel|J.M. Barrie
Roulette is a little more amusing, as it is more intelligible to the looker-on.Stray Studies from England and Italy|John Richard Greene
I ought to have known that I was only fit to be a looker-on when I fell at the first fence.The Tidal Wave and Other Stories|Ethel May Dell
For this reason whenever this looker-on took contact with things he attracted attention.Victory|Joseph Conrad
Were it my nature to be other than a looker-on in life, I would attempt your rescue.Beneath an Umbrella (From "Twice Told Tales")|Nathaniel Hawthorne