動詞 drop dead:

1. pass from physical life and lose all bodily attributes and functions necessary to sustain life
   同義詞：die, decease, perish, go, exit, pass away, expire, pass, kick the bucket, cash in one's chips, buy the farm, conk, give-up the ghost, pop off, choke, croak, snuff it

副詞 drop dead:

1. extremely
   同義詞：drop-dead