三七日
also: みなのか · さんしちにち
Meanings
1
21st day after death; 21st day after birth
Buddhist term for the 21st day after a person's death, when a memorial service is often held. Also used for the 21st day after a child's birth, though this usage is less common.
Hold a memorial service on the 21st day after death.
Celebrate the 21st day after birth.