(reflexive) to hit one another

Alternative form of entre quatre yeux

a wine region in Bordeaux, France, situated between the rivers Garonne and Dordogne, and bounded in the east by the border of the Gironde department and in the west by the Bec d'Ambès

feminine plural of premiers entre eux

an interwar period

middle-aged

coprime (having no factors in common)

(informal) one-to-one, describing a meeting between just two persons

(figuratively) to talk under one's breath, to mutter, to mumble

(figuratively) to have a foot in both camps, to run with the hare and hunt with the hounds, to be sitting on the fence