Round of drinks
A round of drinks is a set of alcoholic beverages bought by one person in a group for the whole group. The buyer buys the round of drinks as a single order at the bar. In many places it is common for people to take turns buying rounds.[1][2]
It is a nearly ubiquitous custom in Ireland, the United Kingdom, Canada, New Zealand, and Australia. In Australia and New Zealand it is called shouting.[3]