Antonyms for the phrase "comes into possession" could include words such as "loses," "forfeits," "surrenders," "gives away," or "donates." Each of these words represents the opposite action of acquiring or obtaining something, meaning that instead of gaining possession, one is either giving it up or transferring it to someone else. For instance, if someone loses possession of something, they may no longer have it or be able to find it. Similarly, if something is forfeited or surrendered, it is given up willingly or unwillingly. In contrast, donating or giving something away means that possession is transferred to another person or entity.