raise some / a few eyebrows

/ɹˈeɪz sˌʌm ɐ fjˈuː ˈaɪbɹaʊz/

to raise some / a few eyebrows

to cause surprise, curiosity, or mild shock among people due to something unconventional, unexpected, or controversial

Examples

1. He raised his eyebrows in surprise when he heard the unexpected news.

2. Of course, the involvement of oil and gas majors, especially in EGS projects that involve fracking, is bound to raise some eyebrows.

3. That certainly raised some eyebrows.

4. For a company that hasn't brought a product to market and has practically no revenue, the valuation raised some eyebrows.