creak
啍 centers on a creaking sound, specifically a low, grating noise. The meaning is narrow and onomatopoeic.
啍 combines 口 (mouth) with 享, which likely contributes the sound. The exact historical development is uncertain, but the structure suggests a phono-semantic compound for a vocal sound.
A mouth 口 making a low, rough sound like a door hinge: 享 suggests the grating tone, so 啍 is a creak.
For トン, imagine a heavy door creaking with a dull 'ton' sound: ton -> トン, and the mouth 口 produces the creak.