Respuesta :
This is the only results I found for spade. I hope this helped a little bit! :)

Answer:
The idea that is typically associated with the word spade is Hard work
Explanation:
In the line from the poem "Digging." by Seamus Heaney "But I've no spade to follow men like them. " the idea of the word spade refers to the hard work of his ancestors, how they worked their lands with their hands and unending hour of hard work to provide their families with what they need, while now he as a poet does not do what his ancestors used to.