Definition of cosmic for English Language Learners. : 1  of or relating to the universe or outer space. : 2  relating to spiritual matters. : 3  very large or important.
Definition of boast. 1 : a statement expressing excessive pride in oneself : the act or an instance of boasting (see 2boast) : brag It may sound like a boast, but I truly am very wealthy.
verb (used without object), pranced, prancing. 1. to spring from the hind legs; to move by springing, as a horse. 2. to ride on a horse doing this. 3. to ride gaily, proudly, or insolently. 4. to move or go in an elated manner; cavort.