eyebrow

: the line of hair that grows over your eye — see picture at face

◊ To raise an/your eyebrow is to move your eyebrow up in a way that shows surprise or mild disapproval. To raise eyebrows is to cause other people to react in this way. These phrases are often used figuratively.

• No one raised an eyebrow [=no one expressed surprise] when he announced that he was planning to run for governor.
• His recent public statements have raised (a few) eyebrows. [=people have reacted with surprise and disapproval to his recent public statements]

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