ran ‧ kle /ˈræŋk ə l/ BrE AmE verb [intransitive and transitive]
[ Date: 1300-1400 ; Language: Old French ; Origin: draoncler , raoncler , from draoncle , raoncle 'sore place' , from Latin dracunculus , from draco 'dragon' ]
if something rankles, you still remember it angrily because it upset you or annoyed you a lot:
His comments still rankled.