Level 5 · word 6,560 of 20,000
undercover
/ˌʌndərˈkʌvər/
American
- adj. 秘密的, 从事间谍活动的
- Definition
- adj. working or done secretly, especially to gather information as a spy
- Example
- The officer worked undercover to gather evidence against the gang.
- 那名警官卧底行动，收集这个团伙的犯罪证据。