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.
夜爪を切ると親の死に目に会えないと言われている。
It is said that if you cut your nails at night, you won't be at your parents' deathbed.