Your request has been hanging around for more than a fortnight yet.
Sure your idiom is not an everyday one.
Crest and bill are both polysemous.
I suppose you ran some searches on line without succeeding.
Sorry, I’ve not been more successful than you.
It can surely have a wide variety of meanings.
If I come across it one day, I’ll let you know.
But maybe the context in which you found it out could help you devising a meaning.
Hi there!
I can't find any reference to this expression anywhere either, sorry! Good luck in your hunt.
Posts: 2715
25 June 2007