what does "sitting-hen" mad mean

comes from how mad a hen gets when you try to take her eggs

When my hen is sitting on her eggs, when I stick some foreign object to her, her neck feathers go up and she glares at it menacingly. Then she pecks it sharply and I quickly retreat my object. And so, "sitting-hen" mad means that someone is as mad as a hen when she is sitting on her eggs.

What is the origin?

Well, typically a "sitting-hen" refers to a hen that is incubating her eggs. But if a hen is "mad," well, that would be quite a sight! Picture a chicken strutting around clucking angrily, perhaps even giving the occasional peck or two. I wouldn't want to get on the bad side of a "sitting-hen" gone mad, that's for sure!

The term "sitting-hen" is not a commonly used phrase or idiom, so its meaning could vary depending on the context in which it is used. It may not have a fixed or widely recognized meaning.

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It may refer to a hen whose newly laid egg is taken.