Engage in magniloquence

BRAG

Think of boasting about your achievements in a way that might make others roll their eyes—it starts with a sound like a farmyard animal.

"Engage in magniloquence" is a fancy way to say "speak in an exaggerated or boastful manner," which directly points to "brag." The word magniloquence combines magnus (Latin for "great") and loquence (speaking), so it literally means "great-speaking"—a perfect fit for someone showing off. The clue plays on the idea of using big words to describe big talk, making the simple answer "brag" a clever contrast.