Definition of "sub-zero" [sub-zero]

• Below 0°C; freezing cold (adjective)

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• "Brooks's husband, Charlie, a race-horse trainer, even runs an alternative medicine "kriotherapy" centre at Champneys, the country house resort in Tring, which uses sub-zero temperatures to treat ailments."
• "The government appealed for communities to watch out for vulnerable neighbours after two people caught out in sub-zero temperatures were found dead."
• "Made out of silicone, they rinse off easily and won't crack in sub-zero temperatures."