HEIGHTENS

Verb

heightens

Third-person singular simple present indicative form of heighten

Source: Wiktionary

HEIGHTEN

Height"en (hit"'n), v. t. [Written also highten.] [imp. & p. p. Heightened; p. pr. & vb. n. Heightening.]

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.

Source: Webster’s Unabridged Dictionary 1913 Edition