In the poem "North" by Seamus Heaney, what is meant by the Aurora Borealis line and the word "nubbed"?
I'm taking notes and learning about the poem "North" by Seamus Heaney, and would like help with the literary analysis of some lines. What is meant by: >Expect aurora Borealis in the long foray, but no cascade of light. I feel this may mean that the poem's speaker should expect to receive flashes of brilliance in his endeavours, but no complete enlightenment. And > trust the feel of what nubbed treasure your hands have known. I can't even find an adequate definition anywhere of "nubbed". Appreciate the help.