He was hail-fellow-well-met at the reunion, chatting easily with former classmates.
彼は同窓会で愛想が良く、旧友と気軽に話していた。
愛想が良い人が初対面でも朗らかに親しく振る舞う様子を表す
Cheerfully friendly and easy to talk to; sociable in a genial, cordial manner.
hail-fellow-well-metは、古くからの挨拶表現hailとwell metが結びつき、互いに打ち解けて親しく振る舞う性質を表す慣用句になった
