subsidence
n. uncountable C1 Advanced US //səbˈsaɪdəns// UK //sˈʌbsɪdəns// sub·si·dence
n. the slow sinking of the ground or a building into the earth. It often happens because the soil or rock under a structure becomes weak or wet.
n. the gradual sinking or settling of the earth's surface or a structure into the ground. Often caused by the erosion of underlying soil, the collapse of underground cavities, or the drying out of clay.
The heavy rain caused subsidence in the garden.
Engineers are monitoring the old bridge for signs of subsidence that might compromise its structural integrity.
Geological subsidence in the region is primarily driven by the extraction of groundwater, which leaves the underlying sediment layers unsupported and prone to gradual collapse.