informer

Word family  noun informant information informer misinformation disinformation adjective informative ≠ uninformative informed ≠ uninformed verb inform misinform adverb informatively

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++in·form·er /ɪnˈfɔːmə $ -ɔːrmər/ noun [countable]  TELLsomeone who secretly tells the police, the army etc about criminal activities, especially for money 告发者，告密者〔尤指为了金钱〕 SYN informant

in·form·er nounChineseSyllable  

informer
in‧form‧er /ɪnˈfɔːmə $ -ɔːrmər/ noun [countable]someone who secretly tells the police, the army etc about criminal activities, especially for money
   SYN  informant
     

THESAURUS

   ▪ spy someone whose job is to find out secret information about another country: Stalin controlled a network of spies. | The film is basically a spy story.
   ▪ agent/secret agent someone who works for a government or police department in order to get secret information about another country or organization: a secret agent working for MI5 | He is the FBI’s best undercover agent (=one who works secretly and pretends to be someone else).
   ▪ double agent someone who finds out an enemy country’s secrets for their own country but who also gives secrets to the enemy: a former CIA double agent who also worked for the KGB
   ▪ mole someone who works for an organization while secretly giving information to its enemies: A mole in the government was leaking information to the press.
   ▪ informer someone who secretly tells the police about criminal activities, especially for money: Acting on information from an informer, the police raided the house.
   ▪ espionage the work that spies do: He is serving a 20-year prison sentence for espionage.

in·form·erBrE /ɪnˈfɔːmə(r)/ 🔊NAmE /ɪnˈfɔːrmər/ 🔊 nouna person who gives information to the police or other authority （向警方或其他当局的）告密者；线人