Extremely smooth in texture, movement, or operation; effortless and without friction or difficulty.
This phrase has been used since the 1400s, when silk was one of the most luxurious and smoothest materials available. Silk's rarity and desirability made it the gold standard for smoothness comparisons.
Silk's unique properties come from its protein structure, making it naturally smooth at the molecular level - so this isn't just poetic exaggeration but scientific accuracy. The phrase has maintained its power across centuries because silk remains unmatched in its combination of smoothness and strength.
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