lie, deceive
詭 centers on intentional falsehood: lying and deceiving. It implies twisting words or facts to mislead someone.
詭 combines 言 (speech) with 危, which likely contributes both sound and the idea of danger or instability, suggesting speech that is twisted or untrustworthy.
Words (言) that are dangerous (危) are lies meant to deceive. Picture someone speaking with a twisted tongue, their words unstable like a precarious cliff.
For キ, imagine a key witness telling a lie in court: key -> キ, and the false testimony deceives everyone.