Under one roof
If a group of things or people are all “under one roof,” they are all at the same location.
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If a group of things or people are all “under one roof,” they are all at the same location. In the episode, we said that it is possible to still feel lonely even while living with a large family under one roof, or all in the same house. A small university might have its math, science, and English departments all under one roof, or all in the same building.