蟹は甲羅に似せて穴を掘る

かにはこうらににせてあなをほる

expression

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to each their own, different strokes for different folks, cut your coat to suit your cloth, a crab digs a hole like its own shell(proverb)

蟹	crab
甲	armor, high (voice), A grade, first class, former, instep, carapace
羅	gauze, thin silk, Rome, arrange, spread out
似	becoming, resemble, counterfeit, imitate, suitable
穴	hole, aperture, slit, cave, den
掘	dig, delve, excavate