Cup/kʌp/ Definition 1 of 5Pro Tip 1/3Common Beverages Used with tea, coffee, water, or any popular drink, often reflecting a casual mood or homely setting. Join me for a cup of herbal tea. Pro Tip 2/3Informal Gatherings Often used to signify hospitality and friendliness in social contexts and family settings. We sat down and shared a cup of coffee. Pro Tip 3/3Customary Measure In some cultures, it's customary to offer a cup of a beverage as a sign of welcome or comfort. He offered me a cup of water as I entered.