ˌcloak-and-ˈdagger adjectiveadj [usually before noun] SECRETvery secret and mysterious, and usually involving the work of spies 神秘的,秘密的〔常涉及间谍工作〕 a cloak-and-dagger operation 秘密的行动
cloak-and-dagger• His enthusiasm for the cloak-and-dagger business of detection seemed to have waned.• He was arrested after a cloak-and-dagger operation involving the CIA and MI6.