Downfall
来自Big Physics
wiktionary
From down- + fall. In this spelling, from 16th century; spelled as two words from 13th century.
etymonline
downfall (n.)
early 14c., "ruin, fall from high condition, complete overthrow," from down (adv.) + fall (v.). From c. 1500 as "a falling downward." Verbal phrase fall down in the sense of "go to ruin" is attested from late 12c.
