among other things, inter alia

in brackets (between brackets) / by the way; as an aside

coprime (having no factors in common)

an interwar period

middle-aged

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

feminine plural of premiers entre eux

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

(literally) between a dog and a wolf / (by extension, idiomatic) at dusk, at twilight; gloaming / (photography) golden hour (used in same technical sense for “good photographic light at twilight”)

(literally) Between the tree and the bark / (by extension, idiomatic) In a bad situation; between a rock and a hard place