Lupin's goin' after something in the Pharaoh's tomb.

（ルパンはファラオの墓にある何かを狙っておるのです！）
　ルパン三世「ルパン対複製人間」より。ルパンはピラミッドに現れる、と信じて警備を配する銭形警部と、それを疑うエジプト警察とのやりとりの中で。

• go after＝「〜を追いかける、（仕事・賞など）を求める、得ようとする」（Chase, try to get／ to follow or chase someone or something because you want to catch them／to try to get something／to try to get or obtain someone or something）
• 追いかける目的が人や動物だととてもわかりやすいけど、物になるとちょっとわかりにくくなる。聞いて意味をとることはできても、自分で使うとなると特に。
  • The cat went after the pigeon, but it flew away.
  • Joe went after her to make sure she was unhurt.
  • I can't decide whether to go after the job or not.
  • The police detectives went after the whole gang.
  • The dogs went after the burglar.
  • I went after the gang that took my wallet.
  • The bear went after the hunters and scared them off.
  • There are a lot of people going after a piece of the budget, and some of them won't get any funding.
  • I know I'll never fall into the trap of going after the big bucks.
  • The candidate went after his opponent in a very personal way. ※opponent：対抗者、敵