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clean bill of health (informal) an affirmation of satisfactory condition, qualification, or the like.
clean coal technologies designed to reduce emissions of carbon dioxide and other pollutants that are generated in the process of coal combustion.
clean-cut having a neat, regular, well-defined shape or outline. [2 definitions]
cleaner someone or something that cleans. [2 definitions]
clean-handed free of responsibility or guilt; blameless.
clean house to force out all undesired people or things.
cleaning clothing or other articles taken to a dry-cleaning establishment.
cleanliness the condition of being clean, or not dirty; the habit of always keeping clean.
cleanly always personally clean. [2 definitions]
clean out to rid of money. [2 definitions]
clean room an enclosed space kept as free as possible of any contaminants such as dust or germs, as for the production of highly sensitive precision parts.
cleanse to make clean; remove dirt from. [2 definitions]
cleanser a liquid or powdered substance used for cleaning, esp. pots, household appliances, and surfaces.
clean-shaven hairless or without facial hair, as from recent shaving.
clean slate an honorable record. [2 definitions]
cleanup a process of making thoroughly clean, socially acceptable, or free from imperfection.
clean up to wash or clean. [3 definitions]
clean up one's act (informal) to improve one's performance or behavior.
clear free of clouds or haze. [22 definitions]
clearable combined form of clear.
clearance the space between things that prevents a collision. [4 definitions]