Correct spelling for the English word "braggest" is [bɹˈaɡəst], [bɹˈaɡəst], [b_ɹ_ˈa_ɡ_ə_s_t] (IPA phonetic alphabet).
The word "braggest" is a derivative of the word "brag", which originated in the late 16th century. The etymology of "brag" can be traced back to the Middle English word "braggen", and further back to the Old Norse word "bragð", meaning "to creak" or "to crackle". Over time, the meaning of "brag" evolved to refer to boasting or expressing excessive pride in oneself. "Braggest" is the superlative form of "brag", often used to describe someone who boasts or brags more than others.