Correct spelling for the English word "beganst" is [bɪɡˈanst], [bɪɡˈanst], [b_ɪ_ɡ_ˈa_n_s_t] (IPA phonetic alphabet).
I apologize, but I couldn't generate a definition for the term "beganst" as it seems to be an uncommon or potentially misspelled word. It is possible that you meant to refer to another term or phrase. If you have any specific alternative words or phrases that you would like to know the definition for, please feel free to ask.