Something described as eyebrow raising is surprising or unexpected enough to make people react with a look of disbelief or mild disapproval. It is usually said of behaviour, a decision or a piece of news that strikes others as odd or improper, without necessarily being wrong or scandalous. The phrase can carry genuine disapproval or simply mark something as unexpected, depending on the tone in which it is used, but it always points back to the same small physical reaction that gives the idiom its name. It appears both as a verb phrase, to raise eyebrows, and as the compound adjective eyebrow-raising, applied to whatever prompts the reaction.
What’s the origin of the phrase ‘eyebrow raising’?
The phrase grows directly out of the gesture itself. Lifting the eyebrows is an old and instinctive way of signalling surprise, doubt or disapproval, and English speakers eventually began using the description of that gesture to stand for the reaction it produces, rather than describing a person’s actual face at all. Once the words could be used this way, they no longer needed a real eyebrow behind them: a policy, a remark or a piece of gossip could be called eyebrow raising even though nobody’s face was mentioned.
That shift from a literal act to a figurative one is generally dated to the early 1900s, when this transfer of a physical gesture to the feeling it expresses became established. An early example of the figurative use appears in Lytton Strachey’s 1918 book Eminent Victorians, where he wrote that “the most steady-going churchman hardly raises an eyebrow at it now.” The sentence only works because raising an eyebrow was already understood as shorthand for surprise or mild disapproval, not as a literal description of someone pulling a face.
From that point the phrase settled into ordinary use, describing anything from a mildly odd choice of clothes to a genuinely startling piece of news. Its usefulness lies in its vagueness: it lets a speaker register that something is worth noticing, without committing to outright criticism or outright surprise, and without spelling out exactly what the reaction is. That flexibility is probably why the figurative sense has lasted so well since the early twentieth century, long after the literal gesture it describes stopped needing any explanation.