go into mourning

• 举哀; 服丧； 戴孝

go into mourning的用法和样例：

例句

1. According to local customs, the mourning period should be at least three weeks.
   民间讲究披麻戴孝至少服满三七。
2. After the death of an elderly person, children and grandchildren should put on mourning apparel.
   老人去世后，儿孙们要披麻戴孝。