It's a figure of speech that means 'to welcome'. When you welcome someone close to you, you may hold your arms out to them, rather than folding them defensively. Thus you are welcoming them 'with open arms'.
This is not an idiom. It actually means to stretch your arms and legs. To take a break.
To be exposed
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Origin "up a storm"
No
The idiom "twelvemonth" comes from Old English, where it referred to a period of twelve months or a year. Over time, it evolved into a more formal or poetic way of saying "year."
This idiom gives the image of someone with their arms spread out to either side. You say this when you're about to hug someone. You might also use it to mean any inviting stance.
The idiom "to brain someone" is thought to have originated from the idea of using one's brain as a weapon to strike or hurt someone. It is a figurative expression that means to hit or strike someone on the head with great force.
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To hope for the best
It is just an idiom and has no history.