drop dead vs buy it

drop dead and buy it both are verbs.

Word	Noun	Adjective	Verb	Adverb
drop dead	No	No	Yes	No
buy it	No	No	Yes	No

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

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

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

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