up on

• Неформальное фразовое выражение, означающее быть хорошо осведомлённым или знающим в определённой теме, предмете или текущих событиях.

An informal phrasal expression meaning to be well-informed or knowledgeable about a particular topic, subject, or current events.

1. Knowledgeable aboutB2informal

   To be well-informed or up-to-date about a particular subject or topic.

   Осведомлённый

   • She is really up on current events.
   • He keeps himself up on the latest technology trends.
   • You need to be up on the rules before playing the game.