Bystander

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wiktionary

ref 

by- +‎  stander


etymonline

ref

bystander (n.)

"spectator, one who stands near," 1610s, from by + agent noun from stand (v.). They have been innocent at least since 1829. Stander-by is from 1540s.

取自“https://www.bigphysics.org/index.php?title=Bystander&oldid=32658”