Say when | English phrases | being polite in English A: Say when. B: When. When do we say this in English? Person 1 can say "say when" when they are pouring a drink or giving food. Person 2 can say "when" when they mean "stop." -You can say "say when" to a guest when you are pouring them a drink. -A barista in a coffee shop can say "say when" to you when they are pouring milk or sugar in your coffee. -A host might say "say when" to you when they are putting food on your plate. Do you have someth