Rhyming slang

Ducks -- 'Buildings that are meant to mimic things, such as objects or animals, are called 'Ducks,' and are among the most popular roadside attractions. The term 'duck' came about in reference to one building, The Big Duck in Riverhead, Long Island, but the term now refers to all buildings which are disguised as other sorts of objects.'

www.state.ky.us/agencies/khc/roadside.htm

OK, it's not exactly a phrase. But I think it's interesting.

If it looks like a duck and walks like a duck, it's a duck. It could a a dry cleaners.

The French would probably consider it a canard.

psi

Back in the 1930s, when I was a boy in the East End of London, and for many years after, 'ducks' was a cockney expression of familiarity between acquaintances. I've forgotten how many times I heard the greengrocer say to my mother, ' 'ow are yer then, ducks.' Origin? - I don't know, but rhyming slang is probably in there somewhere.

Oh, I hope not.