get muddy
溷 centers on becoming muddy or turbid, typically of water. The single given meaning 'get muddy' captures the core idea of liquid becoming clouded with sediment.
溷 combines 氵 (water) with 圂, which likely contributes both sound and the idea of enclosure or turbidity. The exact historical development is uncertain, but the character is associated with muddy or dirty water.
Water 氵 trapped inside an enclosure 圂 becomes stagnant and muddy. Picture a penned area where water cannot flow freely, turning murky.
For コン, imagine a con artist stirring up muddy water to hide what they are doing: con -> コン, and the water gets muddy.