一切經音義 8.274

8.274

難敵（徒的反杜注左傳云敵對也又云當也爾雅匹也廣雅輩也敵述也從文從啇省聲也）。

難敵 (nándí; the lower character has the fanqie 徒的反 [dí]; Du's commentary on the Zuozhuan says that dí means an opponent, and also to match; the Erya says it means an equal; the Guangya says it means peer, or to match; it is composed of 文 with an abbreviated 啇 giving the sound).