on a mission

介词短语
中文释义
英 /ɒn‿ə ˈmɪʃn̩/    美 /ɑn‿ə ˈmɪʃən/

英文释义

介词短语
  1. Actively and determinedly engaged on a task.
    — So she walked and as the night begun^([sic]) to engulf the countryside Emily still did not tire, she was on a mission; a mission to save her friend, her sister.
  2. Looking for drugs; on a drug run. slang
    — I'm slipping on my khaki suit (Which one?) / The blue one, gun by my side as I mob to the beach / On a mission and I'm fishing for my DJ Warren G

词源

From on + a + mission (“set of tasks that fulfils a duty or purpose; deeply felt ambition in life”).
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