Learner's definition of BURR
alsobur : a rough covering of a nut or seed
◊ Burrs often have small hooks that stick to clothing and fur.
2 : a rough area on a piece of metal that is left after the metal is cut 3 : a strong way of pronouncing r that is used by some speakers of English especially in northern England and in Scotland — usually singular
a burr in/under the saddleUS, informal
: someone or something that is a constant cause of trouble or annoyance