a week yesterday, last Monday, etc.
a week yesterday
A week and a day before today. I last saw Stu a week yesterday, before he left on vacation. Oh, we're massively behind—we really needed that report finished a week yesterday. I came down with the flu a week yesterday and am only just starting to feel better now.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
a ˌweek ˈyesterday, last ˈMonday, etc.
(especially British English) seven days before the day that you mention: It was a week yesterday that we heard the news.Farlex Partner Idioms Dictionary © Farlex 2017