A stile is a small arrangement of steps — often just two or three wooden boards, sometimes stone slabs set into a wall — that lets a person climb over a fence or wall while keeping animals on their own side. That double job is the whole design. A gate would let the sheep out. A solid wall would keep the walkers out. A stile lets people through and stops animals, because a sheep or a cow cannot manage steps. You meet the word mostly in Britain and Ireland, in the countryside, and mostly in connection with walking. England has public footpaths that legally cross private farmland, so a walker following a path may need to cross a dozen fields, and there is a stile at each boundary. Because of this, the word turns up constantly in walking guides, maps, and country novels: "go through the gate, across the field, and over the stile." It is not a formal or literary word — farmers and walkers say it plainly — but it is a word tied to a place. A Taiwanese student may go a lifetime in English without needing it, then meet it three times in one afternoon reading a novel set in the English countryside. There is a second, much narrower sense used by builders and carpenters: the vertical side pieces of a door frame or panelled door are called stiles. Unless you work with wood, you will not meet this one.

階梯式的柵欄踏階（英國鄉間讓人跨過圍籬、但羊牛過不去的木階）