Clear blue water British phrase noun informal
There's no clear blue water between me and you, so let's make a fair game.
The discussion did not point out any clear blue water between the candidates.
To be able to distinguish between two individuals or objects (especially by recognizing their differences).
To have no influence on someone, either positive or negative.
The idiom derived from the 1990s as a political slogan which stands for the ideological gap between the British Conservative party and its political opponents.