Making something stronger, more extreme, or more concentrated; increasing in power or effect.
From 'intensify' (from Latin 'intensus,' past participle of 'intendere' meaning to stretch or strain) plus '-ing' for the present participle form.
The root 'tensus' literally means 'stretched'—so intensifying is about stretching something to its limits, which is why we talk about 'intense' situations as if they're pulled taut like a rope.
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