to spy, to watch for
覰 centers on covert observation: spying or watching for something, often with a sense of stealth or scrutiny.
覰 combines 見 (see) with 虘, which likely contributes a phonetic element. The exact historical development of 虘 is uncertain, but the character as a whole conveys the idea of looking or watching.
The left side 虘 looks like a crouching figure under a cover, and the right side 見 is an eye. Imagine someone hiding and peeking out to spy or watch for something.
For ソ, picture a spy whispering 'so...' as they observe a secret: 'so' cues ソ while they watch intently.