踏上
tà shàng · HSK 7
to set foot on
👣 踏 = tread/step + 上 = on/up; literally to tread onto something
踏 means to tread or step with the foot (note the 足/foot radical on the left), and 上 means on or up. Together: to set foot onto a path, train, or journey.
踏 — foot radical 足 + 沓 (phonetic)
踏 combines the foot radical 足, which signals meaning related to feet or walking, with 沓 as the phonetic component hinting at the sound. The character originally meant to step on or tread, and this core sense of placing the foot down has remained stable through history.
上 — horizontal line above a baseline
上 is an indicative character (指事): a short stroke placed above a longer reference line shows the concept of 'above' or 'up'. The earliest oracle-bone forms used two horizontal lines for this; the modern shape added a vertical stroke for clarity. The core meaning of 'upper, above, to ascend' has stayed stable for millennia.