板子一枚下は地獄

いたごいちまいしたはじごく

expression

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there is only the thickness of the boat's planking between one and perdition, on a boat, one is only an inch or two from a watery grave(proverb)

板	plank, board, plate, stage
子	child, sign of the rat, 11PM-1AM, first sign of Chinese zodiac
一	one, one radical (no.1)
枚	sheet of..., counter for flat thin objects or sheets
下	below, down, descend, give, low, inferior
地	ground, earth
獄	prison, jail