sing or praises
sing (someone's or something's) praises
To speak very highly of something or someone; to enthusiastically endorse someone or something; to extol the virtues, benefits, or good qualities of someone or something. Our manager has been singing the new developers' praises. I hope they're up to the job! Jeff sang his phone's praises right up until it froze on him all of a sudden last night.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
sing someone's or something's praisesand sing the praises of someone or something
Fig. to praise someone highly and enthusiastically. The boss is singing his new secretary's praises. The theater critics are singing the praises of the young actor.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.