Heightening

She tried to allay their fears but only ended up heightening them.

Source: tatoeba (699979)

And so let freedom ring from the prodigious hilltops of New Hampshire. Let freedom ring from the mighty mountains of New York. Let freedom ring from the heightening Alleghenies of Pennsylvania. Let freedom ring from the snow-capped Rockies of Colorado. Let freedom ring from the curvaceous slopes of California.

Source: tatoeba (8304214)

She adds another 48 countries are seriously exposed, heightening the threat of a global debt crisis.

Source: tatoeba (11566494)

For them, there was "an increase in total lymphocyte production, and a higher IG antibody response," among other heightenings.

Source: wiktionary