"Sings someone's praises" refers to praising someone in a generous and enthusiastic way. Some synonyms for this expression include "raves about," "compliments highly," "gushes about," "extols," "lauds," "admires," "applauds," "acclaims," "celebrates," "hails," "honors," "respects," "reveres," "idolizes," "worships," "cherishes," and "treasures." All of these words convey a sense of admiration, reverence, and respect towards the person being praised. It's important to show appreciation for people's accomplishments and positive attributes, and using these synonyms can help to express praise in a more varied and interesting way.