sleeping cart
轏 refers specifically to a sleeping cart, a type of vehicle designed for resting or sleeping while traveling.
轏 combines 車 (vehicle) with 孱, which likely contributes a phonetic element. The exact historical development is uncertain, but the structure suggests a specialized cart.
A cart (車) with a complex right side (孱) that looks like a cramped sleeping compartment: imagine a vehicle where you can lie down and rest.
For サン, picture a sleeping cart parked under the sun (サン): the sun's warmth makes it a cozy place to nap.
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