When we place a negative word before expressions like bore to death, does it negate the word bore, therefore making boredom non-existent? Or does it negate the whole expression, making boredom slightly existent? Or does it all depend on context, and the intention of the speaker? For example, If I said:
The teacher taught me how to solve math problems with fun. He didn't bore me to death.
Does it mean: He didn't bore me at all? or does it mean: He slightly bored me but not as much as, say, the other less-experienced math teacher who typically does.