Like a weathercock

[Tdol]

How about fairweather friend?

[mfwills]

A completely different idiom, completely different meaning.

[julio]

Originally Posted by Hortence

I beg to disagree with you, women are not all weathercocks. I know a few men who are though. Here's a little anecdote: Our Prime Minister in Québec insulted a member of the opposition once (a man) by saying that he was a weathercock. Since then, it is forbidden to use this word during sessions in the Parliament. See!

Apologies. It wasn't intention to upset anybody. I realise though that the "derogatory" term is mostly applied to women... if I'm right, that is. Surely, a man can be likewise and even worse.