noun
the action of making something higher or more intense
verb
the act of increasing or raising something to a higher level
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The heightening of tensions between the two countries has led to increased military presence along the border.
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The heightening of drama in the reality TV show has kept viewers hooked on every episode.
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The heightening of the party last night was off the charts!
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The heightening of emotions during the heated debate made it difficult to reach a resolution.