rarefy - Dictionary definition and meaning for word
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rare ~ low in density (therefore thin, sparse)
-fy is a root means "to make".
you "make" something "thinner" is rarefy.
rarely is anyone thin these days
rare+fy(fry)=> if we will fry something it will become weaken
THIN people are RARE these days
forests become LESS DENSE => animals become RARE