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.
prance-to walk with a lofty proud gait, often in an attempt to impress others; He struts around like a rooster in a hen house. strut, swagger, tittup, sashay, cock, ruffle.