把東西或人往前推送
這一支就是字面本身：真的有東西在空間裡移動，而且背後真的有力量。差別只在被推的是物體還是人。
verb · B2
To push or drive something forward so that it moves. The force can come from an engine, from wind or water, or from a person's own arms and legs.
推進／推動前進
核心畫面
One way to hold propel is a force sitting behind something and sending it forward. The force is not a single tap; it works on the thing and the thing travels. Put a motor behind a boat and the boat crosses the water. Put a hand on a person's back and the person goes through the door. Put one lucky event behind someone's life and they end up somewhere they were not before. The thing being moved changes from a hull to a body to a whole situation, but the picture stays the same: power at the back, movement at the front.
propel 可以想成「一股力量待在後面，把東西往前送」。那不是輕輕碰一下，而是持續出力，東西真的走了出去。船後面裝…更多收起
propel 可以想成「一股力量待在後面，把東西往前送」。那不是輕輕碰一下，而是持續出力，東西真的走了出去。船後面裝馬達，船就過得了海。手放在人的背上，人就穿過了門。某件事出現在一個人的人生後面，他就被送到原本不在的位置。被送的東西從船身換成身體，再換成整個處境，但畫面沒變：力量在後，移動在前。From the word’s history
Latin propello is pro- forward plus pello to push, so the word literally means to push forward.
拉丁文 propellō 由 pro-（向前）和 pellere（推）組成，字面就是「往前推」。這個組合跟今天三個用法的畫面完全一致。
Wiktionary entry for propel, supplied in the evidence packet (source_ref kaikki:3f6f69a190036ae4:677737255): From Middle English propellen, from Latin propello, from pro- (forward) and pello (to push, to move).
Two branches
把人推進新的處境
這一支把同樣的畫面搬離實體空間：移動的不是身體，而是一個人在人生裡的位置。這是教學上的連結，不是歷史上的另一條來源。
verb · B2
To suddenly move someone into a new situation, or to push them into doing something, as if a force outside them had carried them there.
把（某人）一舉推上／推進