Usage patterns
冷やで飲むto drink (sake) cold/unheated
In summer I prefer drinking sake cold rather than beer.
お冷やをもらうto get a glass of cold water (at a restaurant)
I got a glass of cold water from the server.
冷やでお願いしますto request sake served cold when ordering
Please serve the sake cold.
Expressions
冷や酒と親の意見は後できくyou will appreciate your parents' advice as you grow older, just as it takes time to feel the effects of unwarmed sake