When the nipples of a male/ female become so cold, they get very pointy. This is known as Sailor Tits, among other terms.
When I was in the navy, it got so cold that me and my mates got Sailor Tits in the winter.
To make matter increase in density, such as paper, pipe tobacco, and cotton.
I'm only adding this definition so that Gordon Smith can see the word Densify on Urban Dictionary.
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