Verb
talk big (third-person singular simple present talks big, present participle talking big, simple past and past participle talked big)
(informal, intransitive) To brag; to exaggerate one's abilities or achievements.
False men and shams talk big and do nothing. Democritus
Listen, if you don't talk big game, you never get anywhere. If you don't think big, you don't get big. Some people call it egotistical, some people call it high hopes, some people call it confidence. It's all in how you want to dissect it. Vanilla Ice