How would you use "beside" as an adverb?
In present-day speech, the only adverbial use of beside is as a synonym of besides with an s.
But archaically, it could also mean various things, including as a synonym for alongside, so to the side of something or nearby. The OED provides this citation (amongst others):
- 1798 S.T. Coleridge Anc. Marinere ɪᴠ, in W. Wordsworth & S.T. Coleridge Lyrical Ballads 23
The moving Moon went up the sky..And a star or two beside.
That means that the moon had a star or two nearby or beside it.