Meaning of side-on

side-on

Pronunciation: (sīd'on', -ôn'), [key]
— adj.
  1. (of two objects) meeting with the sides foremost.
—adv.
  1. with the side or sides foremost, esp. in a collision: The other car struck me side-on.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.