burr, brrr

Burr or burr means a small rough or irregular seed pod or bit of detritus that may stick in an animal's fur, or to clothing--
The dog has a burr struck in his fur.
Oh, it's just a burr on the hem of your pants.

Burr also means a rough or irregular edge, as on a piece of metal, or the tool used to make it--
This piece has a burr on the edge; I can tell it was handmade.
Use this burr to cut the steel; it will give it a rough edge.

Burr may also mean a rough or irregular accent in speech, as a person from Scotland might have to a Briton, or a rough or irregular sound in general--
We knew he was from Scotland when we heard his burr.
He had a distince burr, like someone from Wales or Scotland.

Brrr or brrr ( sometimes spelled with more r's, sometimes with fewer ) is the sound people make to indicate that they are very cold, or that the weather is harsh--
Brrr, it's cold out!
Look at all that snow, brrr!

Now that you know that, you can say--
"Brrr! We can wait until we get inside to look for the burr."