1. Bird in the hand: This phrase, which dates back to the 16th century, refers to the idea of having something tangible and certain rather than something uncertain or intangible. It's often used in the context of making a decision or taking a risk. For example, someone might say "I'd rather have a bird in the hand than two in the bush," meaning they would prefer to have something they can hold onto rather than something that is uncertain. Over time, the phrase "have a bird" came to be used more generally to express a sense of satisfaction or contentment.
2. Bird on the head: This phrase originated in the 17th century and was used to describe someone who was foolish or eccentric. It was based on the idea that a bird landing on someone's head was a sign of stupidity or madness. Over time, the phrase "have a bird" evolved to mean "be crazy" or "have a screw loose."
3. Bird in the bush: This phrase, which dates back to the 15th century, refers to something that is uncertain or unattainable. It's often used in contrast to "a bird in the hand," which represents something tangible and certain. Over time, the phrase "have a bird" came to be used more figuratively to express a sense of frustration or disappointment about not achieving something.
So, depending on the context, "have a bird" can have different meanings, ranging from satisfaction and contentment to foolishness and disappointment.