raise your eyebrows
US /reɪz jʊər ˈaɪˌbraʊz/
UK /reɪz jʊər ˈaɪˌbraʊz/

1.
to show surprise or disapproval by moving your eyebrows upwards
:
•
She couldn't help but raise her eyebrows at his outrageous suggestion.
•
The news that he was getting married made everyone raise their eyebrows.