soak, steep, sodden, soaked
漚 centers on thorough saturation with liquid: soaking something until it is steeped, sodden, or completely soaked.
漚 combines 氵 (water) with 區, which likely contributes the sound. The character expresses the idea of water acting on something, leading to soaking or steeping.
Water 氵 pours over the right side 區, like a container being filled. Picture a cloth left in a basin until it is completely sodden.
For オウ, imagine an old man saying 'Ow!' as he soaks his sore feet in hot water: 'Ow!' -> オウ, and the water soaks away the pain.