면 떨어지다

if X, it drops off

A conditional plus 떨어지다, which has several senses and these lines use most of them: something coming off when you do it this way, a price dropping every time he buys, being cut from consideration if nobody says that, coming out worse when compared with this one, a drone dropping once it is shot down. Which opposite you want depends on the sense, since it is rising for the price one but passing for the audition one.