The soldier stood guard completely still — strict discipline.
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From 《金瓶梅词话》 (Ming dynasty): "金莲坐在床上，纹丝儿不动" — Pan Jinlian sitting stone-still on the bed. 纹丝 literally "a fine thread's worth," i.e. the smallest possible movement.
memory
纹丝 = "a thread's wrinkle" — not even that tiny a twitch. So: completely motionless.
