プログレッシブ和英中辞典(第4版)の解説
つう【通】
❶〔精通していること〕an authority ((on))，an expert ((in, at, on))；〔目利き〕a connoisseur ((of))
情報［消息］通
a well-informed person
彼はなかなかの経済通だ
He is very well informed [versed] in economic matters.／He's an expert on economics.
彼女はアラブ通だ
She is an authority on the Arab world.／She is well acquainted with the Arab affairs.
彼女は映画通だ
She 「is very knowledgeable [knows everything there is to know] about movies.
彼は何事にも通ぶる
He pretends to know everything about everything.
❷〔さばけている様〕
なかなか通な計らいだ
He showed very understanding discretion.