Evidently from brigand.

Journ. Lond.

BRIL, s. The merry thought of a fowl.
V. [Breels].
Sibbald.

Teut. bril, ossiculum circa pectus a specilli similitudine dictum.

BRYLIES, s. pl. Bearberries.
V. [Brawlins].

BRIM, BRYM, BREME, adj.
1. Raging, swelling; applied to the sea.
Bellenden.

Isl. brim, the raging of the sea. The word is thus defined; Aestus maris, vehementibus procellis littus verberans; Olai Lex. Run. A. S. brim, brym, salum, aequor, mare, the sea.

2. Fierce, violent.
Bellenden.
3. Stern, rugged, applied to the countenance.
Douglas.
4. Denoting a great degree either of heat or of cold.
Douglas.
Thus, "a brim frost," is still a common phrase for a severe frost, S. B.

Brymly, adv. Fiercely, keenly. Wall. vii. 995.
V. [Artailye].

BRIM, s. A cant term for a trull, Loth.