One way to hold this word is to hear its two small parts. Down is how far the person has fallen, and out is how little is left to fall back on. Put together, they picture someone at the bottom with the money gone and no way back in sight. Every use points at that same low place, and the senses differ only in how far the picture is taken.
可以想成把這個字拆成兩塊來聽。down 是「一路往下掉」，out 是「東西用完了、沒有退路」。兩個合起來，畫面就是一個人跌到最底，錢沒了，機會也看不到。三個義項講的都是同一個低點，差別只在這幅畫被推到多遠：有時候只說沒錢沒運，有時候已經連住的地方都沒有了。
登入就可以看每一支怎麼連回核心畫面。