Webster's Revised Unabridged Dictionary · 1913

Fourfold

Fourfold , adjective and adverb

[Anglo-Saxon feówerfeold.]

Four times; quadruple; as, a fourfold division.
He shall restore the lamb fourfold. — 2 Sam. xii. 6

Fourfold , noun

Four times as many or as much.

Fourfold , transitive verb

To make four times as much or as many, as an assessment; to quadruple.