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Phrase(s): raise some eyebrows [and] raise a few eyebrows
Fig. to shock or surprise people mildly (by doing or saying something). (Some can be replaced with a few, someone’s, a lot of, etc.) • What you just said may raise some eyebrows, but it shouldn’t make anyone really angry. • John’s sudden marriage to Ann raised a few eyebrows.
McGrawhill's American Idioms And Phrasal Verbs