Be on the same wavelength/on different wavelengths - Idioms by The Free Dictionary
be on the same wavelength/on different wavelengths
be on the same wavelength
To be in agreement; to think or behave similarly. I was surprised that we became friends so quickly, but we're just always on the same wavelength.
be on the same ˈwavelength/on different ˈwavelengths (informal) have the same/different opinion or feelings about something: I find him difficult to talk to — we’re on completely different wavelengths. ♢ On the subject of marriage, Judith and I are on the same wavelength.