noun
single wall; one wall
Refers to a wall that is only one layer thick, often implying thinness or lack of privacy. Commonly used in expressions like 壁一重隔てて (separated by just a single wall).
隣の部屋とは壁一重隔てただけだ。
It's separated from the next room by just a single wall.
壁一重のアパートでは、隣の音がよく聞こえる。
In an apartment with single walls, you can often hear the neighbors.
一重 means 'one layer' or 'single'. 壁一重 combines it with 壁 to mean 'a single wall'.
Compound of 壁 (wall) and 一重 (single layer). The reading かべひとえ follows standard kun'yomi readings.