inward-opening (door/window)
Describes a door or window that opens toward the inside of a room or building. Often contrasted with 外開き (outward-opening).
このドアは内開きなので、押して入ってください。
This door opens inward, so please push to enter.
Compound of 内 (uchi, 'inside') and 開き (hiraki, 'opening'), from the verb 開く (hiraku).