Webster's Revised Unabridged Dictionary · 1913

Gnar

Gnar , noun

[Old English knarre, gnarre, akin to OD. knor, German knorren. Compare Knar, Knur, Gnarl.]

A knot or gnarl in wood; hence, a tough, thickset man; -- written also gnarr. [Archaic]
He was... a thick gnarre. — Chaucer

Gnar , intransitive verb

[See Gnarl.]

To gnarl; to snarl; to growl; -- written also gnarr. [Archaic]
At them he gan to rear his bristles strong, And felly gnarre. — Spenser
A thousand wants Gnarr at the heels of men. — Tennison