sui-sui
Moving forward with ease and grace, as if encountering no resistance. Used for swimming, skating, or any smooth motion.
💡Watching a good swimmer — 'She swims sui-sui across the pool effortlessly.'
彼女はすいすいとプールを泳いだ。
She swam sui-sui across the pool.
The fish were swimming ___ through the clear water.
魚がきれいな水の中を○○泳いでいた。