"I don't know the meaning of the word quit."
"It means to give up."
"No, no. I'm saying I'm not a quitter."
"But quit is the stem of quitter. It gives quitter its lexical meaning."
"What? Look, it's just an expression."
"An expression with an unknown meaning to you."
"No, I KNOW the meaning of the expression."
"But you claim you don't know the key lexical component that *gives* it its meaning."
"Never mind. I give up."
"Or 'quit', for brevity."