knowledge, discrimination, treachery
諝 centers on mental sharpness applied to people: keen knowledge and the ability to discern, but with a dark side of using that insight for deceit or treachery.
諝 combines 言 (speech, words) with 胥, which likely contributes the sound and may relate to mutual or assistant ideas. The exact historical development is uncertain, but the character is associated with knowledge and discernment expressed through words.
Words (言) combined with 胥 (suggesting mutual insight) give the idea of using speech to show sharp knowledge or to deceive. Picture someone whose clever words can either enlighten or betray.
For ショ, imagine a show of clever words: a person on stage using knowledge to impress or trick the audience. Show -> ショ.