Something of some value that is already acquired. Taken from the proverb "a bird in the hand is worth two in the bush," which means that having something, even if it is a lesser quantity, is better than taking the chance of losing it in order to attain something else that seems more desirable. Stephen: "I enjoy dating Nicole, but I'd really like to ask Debbie to dinner." Mark: "If you do that, Nicole will break up with you. Don't forget that a bird in the hand is worth two in the bush."