muelle
/ˈmweʝe/ · B1 · adj
soft, mild
🛋️ From Latin mollis, soft, the same root as English mollify and emollient
A spring is what makes a sofa or mattress give, so the device meaning grew out of the soft one. Don't mix it up with the other muelle, a dock or pier, which comes from Latin moles, a massive structure.