These two are standing abreast.
- Ces deux-là se tiennent côte à côte.
Several yachts were sailing side by side far out at sea.
- Plusieurs yachts cinglaient côte à côte au large.
Tom and Mary then found themselves side by side at the start of this sentence and undertook to explore it.
- Tom et Mary se retrouvèrent alors côte à côte au début de cette phrase et entreprirent de l'explorer.