活躍
かつやく · katsuyaku · JLPT N3 · noun
activity
🏃 活躍 = lively (活) + leap (躍): leaping into action, playing an active role
活 means alive or lively, as in 生活 (life). 躍 means to leap, as in 跳躍 (jump). Together they describe someone who jumps in and plays an active part: 活躍する means to be active or to shine in a role.
活 — water radical 氵 + tongue 舌
Originally a phono-semantic compound: 氵 (water) suggests flowing or liveliness, while 舌 (tongue) hints at the sound. Early forms depicted gushing water, conveying the idea of being lively or alive. The meaning broadened from 'flowing water' to 'living, alive, active.'