Real Dictionary

peacock
countable noun: A peacock is a large bird. The male has a very large tail covered with blue and green spots, which it can spread out like a fan.

Peacock in American English
any male peafowl, esp., one of a species ( Pavo cristatus) with a crest of plumules and long, brightly colored upper tail coverts that can be spread like a fan and have rainbow-colored, eyelike spots
Thomas Love1785-1866; Eng. novelist & poet
to display vanity in behavior, dress, etc.; strut

peacock in American Englishesp collectively
intransitive verb: to make a vainglorious display; strut like a peacock
noun: the male of the peafowl distinguished by its long, erectile, greenish, iridescent tail coverts that are brilliantly marked with ocellated spots and that can be spread in a fan

peacock in British English
noun: a male peafowl, having a crested head and a very large fanlike tail marked with blue and green eyelike spots
noun: Thomas Love. 1785–1866, English novelist and poet, noted for his satirical romances, including Headlong Hall (1816) and Nightmare Abbey (1818)
verb: to display (oneself) proudly