落っこちる

(1)to fall vertically; "the bombs are dropping on enemy targets"

(2)垂直に落ちる

(3)move downward and lower, but not necessarily all the way; "The temperature is going down"; "The barometer is falling"; "The curtain fell on the diva"; "Her hand went up and then fell again"

(4)下と低い方へ向かうが、必ずしもずっと行かない

(1)