Longman Dictionary of Contemporary English homepage

heighten

 verb
     
height‧en [intransitive and transitive]
if something heightens a feeling, effect etc, or if a feeling etc heightens, it becomes stronger or increases [= intensify; ↪ strengthen]:
There are fears that the march will heighten racial tension.
Increased levels of fat in the diet could heighten the risk of cancer.
heighten (somebody's) awareness (of something) (=make people realize something more clearly)
The case has heightened public awareness of the problem of sexual harassment.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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