I am still learning english - thank you (and thanks to baobab who showed me some time ago how to have explanations handy on my PC).
I had no idea just now what a "bigwig" is - now I know:
Big"wig` (?), n. [Big,a.+ wig.] A person of consequence; as, the bigwigs of society. [Jocose] In our youth we have heard him spoken of by the bigwigs with extreme condescension. Dickens.