足
jù , zú · HSK 6
to be sufficient
🦶 Zoo foot — zú sounds like zoo, where you walk on your feet all day
The character 足 originally depicted a knee and foot. As zú it means foot or sufficient (enough to stand on). As jù it means excessive — more than sufficient, an abundance that overflows.
足 — top 口 (mouth/enclosure) + bottom 止 (foot)
Originally a pictograph of a leg and foot, with the upper square representing the knee or shin and the lower part 止 depicting the foot itself. It primarily means 'foot' and by extension 'sufficient' or 'enough,' a meaning shift likely from the idea of standing firmly or having a solid footing.