夜よ爪づめ

noun

cutting nails at night; nighttime nail-cutting taboo

Refers to the Japanese folk belief that cutting one's nails at night brings bad luck, specifically that one will not be present at one's parents' deathbed. Often mentioned in the context of old superstitions.

• 夜よ爪づめを切きると親おやの死しに目めに会あえないと言いわれている。

  It is said that if you cut your nails at night, you won't be at your parents' deathbed.