eye·brow 
/ˈaɪˌbraʊ/ noun
plural eye·brows /ˈaɪˌbraʊ/ noun [count] : 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]
▪ 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]
