Definition of "Heighten" :

verb: make more intense, stronger, or more marked

"Pot smokers claim it heightens their awareness."

verb: increase

"Heighten the tension."

verb: make (one's senses) more acute

verb: make more extreme; raise in quantity, degree, or intensity

"Heightened interest."

verb: become more extreme

"The tension heightened."

verb: increase the height of

"The athletes kept jumping over the steadily heightened bars."