mourning house
/ˈmɔːnɪŋ ˌhaʊs/noun
1A tomb, a mausoleum; a building in which human remains are stored, either for the purpose of ritual or interment.
2A house occupied by people in mourning, or used for the purpose of mourning.
3A shop selling mourning clothes, etc. Now historical.
Origin
Late Middle English; earliest use found in Reply Friar Daw Topias. From mourning + house interjection.