perish vs buy it

perish and buy it both are verbs.

Word	Noun	Adjective	Verb	Adverb
perish	No	No	Yes	No
buy it	No	No	Yes	No

As verbs, buy it is a hyponym of perish; that is, buy it is a word with a more specific, narrower meaning than perish:

perish: pass from physical life and lose all bodily attributes and functions necessary to sustain life
buy it: be killed or die

Other hyponyms of perish include abort, asphyxiate, stifle, suffocate, pip out, drown, predecease, famish, starve, fall, succumb, yield.

perish (verb)	buy it (verb)
pass from physical life and lose all bodily attributes and functions necessary to sustain life	be killed or die