wet
溻 centers on being wet or soaked, typically referring to moisture or dampness.
溻 combines the water radical 氵 with a phonetic component that likely contributed the sound トウ. The exact historical development of the right-side component is uncertain.
The left side is water 氵, and the right side looks like a complex structure getting drenched. Picture water pouring over the whole shape, leaving it completely wet.
For トウ, imagine a towel (タオル) soaked with water: the first syllable 'to' from towel cues トウ, and the wet towel matches the meaning.