Back in the day is an idiom used to refer to a time in the past, typically a period remembered with fondness or nostalgia.
While the phrase doesn’t point to a specific calendar date, it serves as a linguistic bridge to the “good old days.” It is frequently used to contrast the present with a past era, like the days of vinyl records or life before the internet, implying that the time being discussed was simpler, better, or at least significantly different.
Although back in the day is usually used to express nostalgia about when the speaker was younger, and also to complain about the present, it can be used in a more practical sense to simply refer to a time in the past in which a particular thing was different.
It can also refer to a time in the distant past, even before the speaker was born, although the idiom ‘in the old days’ is more likely to be appropriate. And even a more poetic way of putting it is “days of yore,” which refers to a much more ancient or legendary time, but is often used in a tongue-in-cheek way to imply that one is very old.
“Back in the Day” vs. “Back in the Days”: Which Is Correct?
Both forms exist in conversational English, but they behave differently depending on grammatical structure and modern idiom conventions:
- Back in the day (Singular — Standard Idiom): This is the established, universally accepted idiomatic phrase. It stands on its own adverbially without needing an extra qualifying noun: “Back in the day, we had to use dial-up internet.”
- Back in the days (Plural — Descriptive Phrase): While historically common in early hip-hop lyrics (and older regional speech), in modern standard English “back in the days” sounds incomplete when used alone. It almost always requires a qualifying prepositional phrase specifying an exact era:
◇ “Back in the days of radio serials, families gathered around the living room set.”
◇ “Back in the days of vinyl, I could get all the new 45 singles for 50 cents each!”
◇ “Back in the days when cars had no seatbelts, road trips felt very different.”
The Rule of Thumb: If you are making a standalone nostalgic statement about the past, use the singular back in the day. If you are specifically naming an era or period (“the days of…” or “the days when…”), the plural back in the days is grammatically natural.
Origin of “Back in the Day”
This idiom has its origins in the latter half of the 1900s, having gained popularity during the 1980s and 90s. It featured particularly in rap lyrics of the day.
Several rap songs from the 1980s (and early 90s, looking back at the 80s) utilize the phrase “back in the day” to evoke nostalgia for the early days of hip-hop culture. While it is not certain that the phrase was exclusive to black culture in those days, it cannot be disputed that rap music made the idiom a household phrase. Below are some of the important rap songs that helped bring this idiom into general use.
- Beastie Boys – “Girls” (1986): This is often cited by lexicographers as one of the earliest recorded uses of the phrase in hip-hop. The opening line is: “Back in the day / There was this girl around the way.”
- Biz Markie – “Vapors” (1988): Contains the line, “We used to be down back in the days” (Note: “days” hadn’t changed to “day” yet.
- Ahmad – “Back in the Day” (1994): This is the definitive “nostalgia” anthem of the 90s. The chorus repeats the phrase constantly: “Back in the days when I was young / I’m not a kid anymore / But some days I sit and wish I was a kid again.” It’s a perfect example of the transition from “back in the days” to the singular “back in the day.”
- The Notorious B.I.G. – “Juicy” (1994): While he doesn’t use the phrase in the main hook, the entire song is the quintessential “back in the day” story, and he often referred to the “old school” era in this way during interviews and live sets.
- Skee-Lo – “I Wish” (1995): Another mid-90s track that leans heavily into the “back in the day” vibe, reflecting on childhood struggles and the culture of the late 80s.
Sentence Examples
“Back in the day, we didn’t spend all our time staring at phones. We actually talked to each other.”
“Saturday Night Live was much funnier back in the day. I don’t know why I keep watching it.”
Gas was less than a dollar a gallon back in the day, and you could fill your tank for twenty bucks.”
“We didn’t have GPS back in the day; we had to rely on paper maps and the kindness of strangers for directions.”
He was a great actor back in the day. Nowadays, he just keeps playing the same character with the same ridiculous accent.”
Similar and Related Idioms
- The Good Old Days: A nostalgic reference to a bygone time remembered as happier, simpler, or more prosperous than the present.
- In My Day: An expression used, often by older speakers, to recall how society, morals, or habits operated during their youth.
- At One Time: Referring to a past period or temporary phase when circumstances were noticeably different.
- Way Back When: An informal, somewhat homey phrase referring to a long time ago in the distant past.
- Time Was When: An old-fashioned or literary way of saying “there was once a time when” something was common or accepted.
- In Bygone Days: A formal or poetic reference to historical eras that have completely passed away.
- In Years Gone By: Referring to events, traditions, or habits from earlier decades or generations.
- Once Upon a Time: A classic fairy-tale opening used idiomatically to denote an ancient, mythical, or long-lost era, often humorously.
- Days of Yore: A literary, archaic term for long-past centuries or legendary antiquity, frequently used tongue-in-cheek to imply someone is very old.