down-draught
Definition
Noun: A downward current of air, especially one that flows into a chimney, furnace, or other enclosed space, often causing smoke or fumes to be drawn downward rather than upward.
Usage Examples
- (A downward air current in the chimney.)
- (A downward air current affecting flight.)
- (A downward flow of air in a technical system.)
Advanced Usage
- "down-draught effect": a phenomenon where air flows downward, often causing problems in combustion or ventilation.
- The down-draught effect in the furnace reduced its efficiency. (The downward air flow impaired performance.)
- "down-draught cooler": a device that uses downward air flow for cooling purposes.
- The factory uses a down-draught cooler to regulate temperature in the workshop. (A cooling system relying on downward air currents.)
Variants and Related Words
- Downdraft (n): an alternative spelling (especially in American English) for "down-draught".
- The downdraft from the helicopter knocked over the equipment. (A downward air current from the rotor blades.)
- Updraught (n): the opposite of down-draught — an upward current of air.
- The hot air created a strong updraught in the chimney. (An upward air flow.)
Synonyms
- Downward air current: a more general term for any flow of air moving downward.
- Subsiding air: a meteorological term for air that descends in the atmosphere.
Related Idioms
- "caught in a down-draught": to be affected by a downward air current, often used metaphorically for being in a difficult situation.
- The company was caught in a financial down-draught after the market crash. (Faced a downward trend or adverse conditions.)
Technical Context
- In meteorology, a "down-draught" refers to a downward-moving air mass within a storm, often associated with heavy rain or hail.
- In engineering, it describes the unintended downward flow of air in chimneys, flues, or ventilation systems.