The phrase "one for the bird" is an idiomatic expression that means something is useless or not worth keeping. Antonyms for this phrase could be "valuable," "useful," or "worthy." If something is deemed valuable, it is considered to be of high importance or worth keeping. Similarly, something that is useful is practical, handy, or functional. Something worthy is deserving of admiration or respect. It is important to recognize antonyms for this phrase to understand the opposite meaning of something being deemed "one for the bird." Instead, if something is valuable, useful, or worthy, it should be kept and treasured.