raise your eyebrows
raise (one's) eyebrows
1. To lift one's eyebrows in a display of shock, surprise, or offense. She raised her eyebrows at the idea, but after I went through the details of the plan, she was agreed to support it.
2. To elicit shock, surprise, or offense, typically through unconventional actions or words. The phrase typically suggests negative attention or judgment. Her irreverent chatter during the ceremony raised many people's eyebrows. Sarah's pink hair definitely raised a few eyebrows, but if she likes it, then that's all that matters.