Antonyms for the phrase "sings praises" could include terms such as "criticizes", "deprecates", "denounces", "disparages", and "condemns". These words all denote negative or critical attitudes toward a person, thing, or idea. Their use in contrast to "sings praises" emphasizes the role of language in shaping the ways in which we think and communicate about the world around us. By utilizing antonyms in our speech and writing, we can highlight important differences and encourage critical thinking and reflection. Ultimately, the use of antonyms helps to create a more nuanced, diverse, and meaningful discourse in our interactions with others.