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become more extreme;
"The tension heightened"
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make more extreme; raise in quantity, degree, or intensity;
"heightened interest"
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increase;
"This will enhance your enjoyment"
"heighten the tension"
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increase the height of;
"The athletes kept jumping over the steadily heightened bars"
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make (one's senses) more acute;
"This drug will sharpen your vision"
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make more intense, stronger, or more marked;
"The efforts were intensified"
"Her rudeness intensified his dislike for her"
"Pot smokers claim it heightens their awareness"
"This event only deepened my convictions"