bow, stoop, bend over, crouch
跼 centers on bending the body downward: bowing, stooping, crouching, or hunching over.
跼 combines 足 (foot/leg) with 局, which likely contributes the sound and the idea of being confined or bent. Together they suggest bending the legs or body into a crouched posture.
The left side 足 means foot or leg, and the right side 局 looks like a person hunched under a roof. Picture someone bending their legs and stooping low to fit into a cramped space.
For キョク, imagine a person crouching so low they look like a tiny kyoku (a made-up word for a curled-up ball). The sound kyoku cues キョク while the body bends tightly.