miraculous
灼 centers on something extraordinary or beyond normal explanation: a miraculous event or quality that stands out as if touched by a divine or supernatural force.
灼 combines 火 (fire) with 勺, which likely contributes a phonetic element. The exact historical development is uncertain, but the character has been associated with the idea of something being illuminated or made manifest by fire, hence miraculous or brilliant.
Fire 火 beside 勺 suggests a flame that reveals something hidden or extraordinary. Picture a miraculous vision appearing in the flicker of a sacred fire.
For シャク, imagine a miraculous shack that glows with inner fire: shack -> シャク, and the fire 火 makes the shack seem supernatural.
becoming red-hot; red heat; scorching heat; burning heat
cautery; cauterization
clearly miraculous; remarkably miraculous; striking
burning mouth syndrome; BMS; glossodynia
to tan (i.e. suntan); to burn
clear; vivid; brilliant
shining; radiant
clear (miracle, sign from the Gods) manifest
bright; beaming; brilliant; glittering