(NAmE also pillow) a cloth bag filled with soft material or feathers that is used, for example, to make a seat more comfortable 软垫；坐垫；靠垫
matching curtains and cushions
颜色协调的窗帘与靠垫
a floor cushion (= a large cushion that you put on the floor to sit on)
地板坐垫
a pile of scatter cushions (= small cushions, often in bright colours, that you put on chairs, etc.)
一堆小靠垫
(figurative)
a cushion of moss on a rock
岩石上的一层苔藓