What does "burr in the saddle" mean?

An irritant; to be irritated by something.

Normally, "burr "under" not "in" one's saddle" also (but much less common) "burr under one's blanket"

http://idioms.thefreedictionary.com/burr

Please check once again whether it is 'burr in the saddle' or 'burr under the saddle'?

If it is burr under the saddle---then the meaning is 'to be irritated by something'.

Please wait for other answers too.

I still don't understand why "burr under one's blanket" means an irritant. In particular, what does "burr" mean here?

Did you look up what a "burr" is?

Imagine you are a horse and you have one between your back and your saddle blanket.

I looked "burr" it up. Would you please let me know which meaning it is in the following webpage?

http://www.merriam-webster.com/dictionary/burr

(missing image)

Hi,

The meaning of a 'phrasal verb or idiom' will be entirely different from the key word. So it is up to you to choose the meaning that you want from the dictionary. I was trying to give you the meaning of the idiom 'to have a burr under the saddle'. Also please visit the following link.

I can see how those definitions are not very helpful.

Take a look at this picture and then try to imagine having it inside your clothes.

http://www.pixmac.com/picture/pike/000007063031

I believe the "burr under one's blanket" is a derivation of a "burr under the saddle blanket," or the blanket one puts on the horse's back before putting on the saddle. In this regard it could mean that there is a clear irritation the cause of which is not readily or easily relieved, or for that matter, apparent.

having a burr under ones blanket means something is bothering or irritatingyou A burr is a seed pod with small spines on it that would hurt a horse if one got under the blanket on his back.