misfit, discordant, music instrument, hoe
鋙 centers on things that do not fit together smoothly: a misfit, discord, or clashing elements. The music instrument and hoe senses are specific objects that may have been associated with the character, but they do not share a clear conceptual center with the discordant idea.
鋙 combines 金 (metal) with 吾, which likely contributes the sound. The exact historical development is uncertain, and the connection between the metal component and the meanings of misfit or discord is not clear.
Metal 金 on the left and 吾 on the right: imagine a metal key that does not fit the lock, creating a discordant scraping sound. The misfit metal piece represents the core idea of things not matching.
For ギョ, picture a metal gear that is a misfit and makes a grinding 'gyo' sound when forced: gyo -> ギョ.