the process of rocks breaking down or decomposing due to long-term exposure to the sun, air, water, or living things; wind erosion

social customs and decency; the standards of behavior considered acceptable in a society

(Taiwan) related to the sex trade or prostitution; often used in terms like "red-light district"

the spontaneous loss of water by a hydrated salt upon exposure to air, resulting in the formation of a powdery deposit on its surface