One of the mysteries of the English language finally explained.
1with object To cool (a liquid) to a temperature below its freezing point without its solidifying.
2with object To cool (a vapour or its liquid condensate) to a temperature substantially below its boiling point at normal pressure, especially (in refrigeration) in order to liquefy it completely.
Early 20th century; earliest use found in Monthly Weather Review. From sub- + cool.
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