interjection used to express surprise
詎 centers on an interjection expressing surprise, similar to an exclamation like "what?!" or "how?!" in English. Its meaning is narrow and tied to this exclamatory use.
詎 combines 言 (speech) with 巨, which likely contributes the sound. The character is used for an exclamatory word, but its exact historical development is uncertain.
Words 言 that are huge 巨 in surprise: imagine someone shouting a giant "WHAT?!" so loudly that the speech bubble itself looks enormous.
For キョ, picture a surprised person exclaiming "Kyo?!" like a startled cry. The sound キョ itself is the interjection, matching the kanji's meaning.