sit down "to" breakfast: an infinitive marker or a preposition?

[sitifan]

When we all sit down to breakfast, we've got even more to add to the list.
Source: https://www.google.com.tw/books/edi...wn+to+breakfast"&pg=PA103&printsec=frontcover

Is "to" an infinitive marker or a preposition?

 

[Flask]

That's funny. It could be either, but I hear "to breakfast" as a preposition followed by a noun in your sentence.

In American English, "breakfast" is almost never used as a verb. We speak of having breakfast, not of breakfasting.

But I'm pretty sure British speakers speak of sitting down to tea, and "tea" isn't a verb.

 

[jutfrank]

Yes, it's a preposition.