Webster's Revised Unabridged Dictionary · 1913

Thrave

Thrave (thrāv) , noun

[Old English þrave, þreve, Icelandic þrefi; akin to Danish trave; compare Icelandic þrīfa to grasp.]

1.
Twenty-four (in some places, twelve) sheaves of wheat; a shock, or stook. [Provincial English]
2.
The number of two dozen; also, an indefinite number; a bunch; a company; a throng. [Obsolete]
The worst of a thrave. — Landsdowne MS
He sends forth thraves of ballads to the sale. — Bp. Hall