bite
齮 centers on the action of biting, specifically using the teeth to cut or grip something.
齮 combines 齒 (tooth) with 奇, which likely contributes the sound. The character is associated with biting, but the exact historical development is uncertain.
The left side 齒 shows teeth, and the right side 奇 suggests something unusual. Imagine a strange creature with sharp teeth that bites unexpectedly.
For キ, picture a key being bitten by the strange creature: key -> キ, and the teeth clamp down on the metal key.