波动
bōdòng · HSK 6
fluctuate
🌊 波 = wave + 动 = move; literally wave-motion = fluctuate
波 (bō) means wave; 动 (dòng) means move or act. Together wave-move describes anything that rises and falls like a wave — prices, sound, emotions. Same 动 appears in 运动 (sports) and 动作 (action).
动 — force 力 + heavy/重 (simplified from 動)
The traditional form 動 combines 重 (heavy) as the phonetic with 力 (force/strength) as the semantic, suggesting the effort needed to move something heavy. The simplified form 动 replaces 重 with 云, keeping 力 to convey action and motion.