下
xià · HSK 1
under (condition/fact etc.)
⬇️ 下 = pictograph: a mark below a horizontal line, meaning under
Mirror of 上 (above). The short stroke sits beneath the long line, fixing the meaning as below or under. Used for condition/fact: 在此情况下 = under these circumstances.
下 — horizontal line 一 + mark below
下 is an indicative character: a long horizontal line represents a reference level, and a shorter stroke placed beneath it points to the area below. The original meaning 'below, down' comes directly from this spatial diagram, and it later extended to verbs like 'descend' and 'lower'.