踩
cǎi · HSK 6
tread
👣 踩 = 足 (foot) + 采 (pick/gather); foot that picks where to step
The 足 radical on the left marks anything foot-related; 采 on the right gives the cǎi sound. So 踩 = foot + cǎi-sound = to step on or tread.
踩 — foot radical 足 + 采 (phonetic)
踩 is a semantic-phonetic compound. The foot radical 足 on the left signals the meaning—an action done with the feet, namely to step on or tread. The right side 采 (cǎi) supplies the pronunciation. The character is relatively late, formed to specify 'tread/step on' distinct from related foot verbs.