Definition of Dry January in English:

Dry January

noun

British
  • January as a month in which one refrains from drinking any alcohol as a personal challenge.

    ‘I had a crack at Dry January but crumbled on day two’
    ‘having done Dry January for the last two years, I know full well the benefits of abstaining from alcohol’

Origin

Early 21st century Dry January is promoted by the charity Alcohol Concern, which has trademarked the term for various goods and services.