Webster's Revised Unabridged Dictionary · 1913

Heighten

Heighten (hīt"'n) , transitive verb

1.
To make high; to raise higher; to elevate.
2.
To carry forward; to advance; to increase; to augment; to aggravate; to intensify; to render more conspicuous; -- used of things, good or bad; as, to heighten beauty; to heighten a flavor or a tint.
To heighten our confusion. — Addison
An aspect of mystery which was easily heightened to the miraculous. — Hawthorne