subsidence

باللغة العربية: هُبُوط، انْخِسَاف، خُمُود

1. The process of becoming less active or severe. (countable, uncountable)
2. A sinking of something to a lower level, especially of part of the surface of the Earth due to underground excavation, seismic activity or underground or ground water depletion, or the rocks in a geological basin, due to continued deposition from above. (countable, uncountable)

الجمع subsidences