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Discover LudwigThe phrase "back in days" is not a grammatically correct expression.
It is missing a key component, such as "the" or "those," to make it a complete phrase. However, it is a commonly used colloquialism in spoken English. It is often used to refer to a past time period or era. For example, "Back in the days before smartphones, people used to have to remember phone numbers."
Exact(3)
Congress authorized a full-scale investigation of the topic back in days of the Great Depression.
The actor's television career, which started back in days of live broadcasting, included series, plays, films, soap operas and commercials.
McCormack had been left out the original squad by Strachan as he wanted to see Phillips in international action, but the 27-year-old Leeds striker is back in days after netting all four of his side's goals in Saturday's win over Charlton Athletic.
Similar(56)
Her son is now back in day care, at the expense of other bills.
They expected to be back home in days.
▪ Duration of the present condition of low back pain (in days).
That was my back-in-the-day," he says.
All were back in two days.
"Back in the Days" is that book.
We fly back in two days' time.
Back in those days it was segregation.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com