English Reference

Word

FBI

Phoneticsfbi

/ˈɛfˈbiˈaɪ/

Definitions

01US law enforcement agency

B2 · Law

n. Stands for Federal Bureau of Investigation. This is the American government agency that handles national security and major crimes.

n. Abbreviation for Federal Bureau of Investigation. The primary federal investigative service of the United States government, responsible for domestic intelligence and law enforcement.

“The FBI is investigating the bank robbery because it involved a federal crime.”

“The FBI collaborated with local law enforcement to dismantle the international cybercrime ring after a two-year investigation.”

American English

Usage

Usually preceded by the definite article 'the'.

Synonyms

federal agentsthe Bureau

02humorous fake title

C1

n. A joke name used on T-shirts or hats that stands for 'Female Body Inspector'.

n. A humorous or satirical initialism for 'Female Body Inspector', typically found on novelty apparel.

“He wore a hat that said FBI, but it stood for Female Body Inspector.”

“The use of 'FBI' as a joke acronym on tourist merchandise is often considered dated or immature in modern social contexts.”

Humorous · Slang · Informal

Teaching tip

This sense is often seen on cheap souvenirs; learners should be aware it can be viewed as sexist or low-brow.

Real-World Examples

“Records show they passed through at least three further FBI agents in the following two days.”
BBC News · 7 Sept 2026
“The FBI warned at the time: “Lang, who is considered an escape risk, may be sailing between Hawaii and other regions like Fiji and Mexico.”
Toronto Sun · 26 Aug 2026

Word family

CBINounFBINoun

This entry

Level
B2 · Upper Intermediate
Frequency
Common
Updated

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English Reference