The idiom "dark as pitch" finds its origin in the pitch, a thick, dark, and viscous substance derived from the distillation of wood or coal tar. The phrase is used to describe a state of extreme darkness or absence of light, likening it to the deep blackness of pitch. The pitch's nature, being highly opaque and light-absorbing, led to its association with profound darkness.

英語での「(as) dark as pitch」の定義と意味

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