What part of speech is 'at all' in the following sentence?

A couple of dictionaries call it an idiomatic adverb. That sounds good to me. It doesn't really modify 'anything'; it modifies 'know anything'.

Mister MicawberA couple of dictionaries call it an idiomatic adverb. That sounds good to me. It doesn't really modify 'anything'; it modifies 'know anything'.

Hi Mister Micawber,
Thank you for your reply.
May I know which dictionaries are they?
It modifies 'know anything'. Isn't 'at all' just used for empahises, besides

Oh, I don't remember—take a look through the dictionaries at OneLook.com and you'll find it: http://www.onelook.com/?w=at+all&ls=a

Thinking Spain Isn't 'at all' just used for empahises, besides what it modifies?

A strange way of

Hi Mister Micawber,
Thank you very much for your reply.

TS

Thinking SpainWhat part of speech is 'at all' in the following sentence?“In fact, I don’t think I know anything about him at all.”

I see the negatively oriented "at all" as a reinforcing post-modifier (a kind of adjunct).

BillJ