One of the mysteries of the English language finally explained.
In Japan: a wooden floor, originally constructed in medieval times to warn of intruders, which when walked on emits a chirruping sound likened to a bird call.
Early 20th century. From nightingale + floor, after Japanese uguisu-bari from uguisu + -bari, combining form of hari, nominalized stem of haru to stretch, lay (floorboards).
nightingale floor/ˌnʌɪtɪŋɡeɪl ˈflɔː/
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