behind one’s back

November 6, 2026 2:01 AM

behind one’s back (idiom)
/bɪˈhaɪnd wʌnz bæk/

Meanings

Doing or saying something when a person is not around and has no idea it is happening, usually in a sneaky or unfair way.
Acting in secret while someone is absent, often with a sense of gossip, criticism, or disloyalty.
Going around someone instead of asking them, especially when you know they would not agree.
Simply happening while a person is not there, though the phrase almost always feels negative or dishonest.

Synonyms: secretly, covertly, surreptitiously, underhandedly, sneakily, without someone’s knowledge, deceitfully, in secret, furtively

Example Sentences

Sarah later found out her coworker had been complaining about her work behind her back in every team meeting, and it completely changed how she felt about the friendship.
Mike went behind his manager’s back and emailed the client himself, which only created confusion and earned him a warning.
The kids kept making fun of the new teacher behind her back instead of saying anything to her face.
Emma was really hurt when she discovered her best friend had been sharing private stories behind her back.
Instead of checking with his brother, he sold the shared property behind his brother’s back while the brother was away traveling.
I really trusted her, so it hit hard when I found out she had been talking about me behind my back the whole time.
If something is bothering you about how I handled it, just tell me straight instead of going around complaining behind my back.

Etymology and Origin

The phrase behind one’s back grew out of something almost everyone understands without thinking. When a person turns away, whatever happens directly behind them stays out of sight. Over time that ordinary physical fact turned into a way of talking about things done in secret. The image never needed a complicated story or a special historical moment. It simply took the idea of a blind spot and used it for gossip, hidden plans, and the feeling that someone has been left out on purpose.

How It Took Shape in England

The expression formed naturally in medieval England. English already had the word behind, which went back to older forms meaning something like “by the rear.” By the 1300s people were putting the fuller phrase behind one’s back together and giving it the sense of acting while someone was absent or unaware. Nothing suggests it was borrowed from French or any other language. It simply grew inside English as speakers looked for a clear way to describe secrecy and, more often than not, a touch of unfairness.

The First Clear Appearances

The earliest surviving examples surface in the late fourteenth century. One shows up in the alliterative poem Cleanness, written around 1325, where someone glances “byhynden her bak.” A little later the Wycliffite Bible of 1382 uses a similar wording when Abraham sees a ram behind him, though that use is still mostly literal. The sense we recognize today appears more fully in Sir Thomas Malory’s Le Morte d’Arthur. Malory finished the work between 1469 and 1470, and William Caxton printed it in 1485. Inside the text comes the line “To say of me wrong or shame behind my back,” already carrying the idea of speaking ill of someone who cannot hear it. From that point the expression settles into regular use with the same basic meaning of hidden talk or hidden action.

Why It Has Lasted

Once the phrase was in place it changed very little. Writers in later centuries kept using it in much the same way, often setting it against the idea of speaking openly to someone’s face. It has stayed alive because the picture still feels immediate: most people know the unease of wondering what is said when they are not in the room. Similar ideas appear in other languages, yet the English version shows no sign of having been taken from anywhere else. Its long life comes from that plain, still-useful image of the space behind a person rather than from any single book or event.

Variants

behind someone’s back
behind my / his / her / their backs
go behind someone’s back
talk behind someone’s back
do something behind someone’s back
laugh / criticize / gossip behind someone’s back