heighten (Verb) — Become more extreme. ex. "The tension heightened"
heighten (Verb) — Make more extreme; raise in quantity, degree, or intensity. ex. "heightened interest"
heighten (Verb) — Add something extra to make more intense or better. ex. "heighten the tension"
heighten (Verb) — Increase the height of. ex. "The athletes kept jumping over the steadily heightened bars"
heighten (Verb) — Make (one's senses) more acute. ex. "This drug will heighten your vision"
heighten (Verb) — Make more intense, stronger, or more marked. ex. "Pot smokers claim it heightens their awareness"