物もの知しり

noun

well-informed person; walking encyclopedia; extensive knowledge

Refers to a person who knows a lot about many things, or the quality of having broad knowledge. Often used in phrases like 物知り顔 (knowing look) or 物知りぶる (to act like a know-it-all).

• 彼かれは本ほん当とうに物もの知しりで、どんな質しつ問もんにも答こたえてくれる。

  He is really knowledgeable and answers any question.