verb/ɑ̃.tʁə.t(ə).niʁ/
to maintain, to look after; to support (e.g. a family); to fuel, to keep something going; to have a discussion (with someone); to keep fit
“Le Canada entretient une relation de premier plan avec les États-Unis, pays avec lequel il partage la plus longue frontière non défendue du monde.” — Canada maintains a high-profile relationship with the United States, a country with which it shares the longest undefended border in the world.
Inherited from Middle French entretenir, from Old French entretenir; equivalent to entre + tenir.