a part of your body that is sore is painful, because of infection or because you have used a muscle too much:
I had a sore throat and aching limbs.
My arms are sore from all the lifting.
something that is likely to make someone upset or angry when you talk about it:
Just don't mention it - it's always been a sore point with him.
3 [not before noun] informal especially American English
upset, angry, and annoyed, especially because you have not been treated fairly:
Mac's still sore because I didn't invite him.
Don't be sore at me - I just forgot to tell you.
4 [only before noun] British English
used to emphasize how serious, difficult etc something is:
Inner city schools are in sore need of extra funds.
someone who gets angry or upset when they lose a game or competition:
Nobody likes a sore loser.
if someone or something sticks out like a sore thumb, they are very noticeable because they are different from everyone or everything else:
You stick out like a sore thumb in that uniform.