From Longman Dictionary of Contemporary Englishstand somebody a drink/meal etcstand somebody a drink/meal etcPAY FOR British English to pay for something as a gift to someoneCome on, Jack. I’ll stand you a drink if you like. →stand
Examples from the Corpus
stand somebody a drink/meal etc• A minute or two later-they are standing, drinkingwine before dinner.• He and Rufus had stood there drinking wine.