verb (used with object)
to increase the degree or amount of; augment: Cézanne's death heightened the value of his paintings.
to strengthen, deepen, or intensify: to heighten the plot of a story; to heighten one's awareness or appreciation; to heighten one's suffering.
to bring out the important features of, as in a drawing: to heighten a picture with Chinese white.
verb (used without object)
to increase: The tension heightened as the enemy forces advanced.
to brighten or become more intense.