English · Slang Attested

fly

In real, traceable use. Part of the curated seed collection; community review is coming.

Sense 1

Both English Tiếng Việt

Meaning · English

Quick-witted, alert, mentally sharp.

Nghĩa · Tiếng Việt

nhanh nhẹn, thông minh

Machine-translated — suggest a fix

Where it’s used: Used American English

Examples

be assured, O man of sin—pilferer of small wares and petty larcener—that there is an eye within keenly glancing from some loophole contrived between accordions and tin breastplates that watches your every movement, and is "fly,"— to use a term peculiarly comprehensible to dishonest minds—to the slig

Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30)

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

Sense 2

Both English Tiếng Việt

Meaning · English

Clandestine, surreptitious

Nghĩa · Tiếng Việt

Lén lút, bí mật

Machine-translated — suggest a fix

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

Sense 3

Both English Tiếng Việt

Meaning · English

Well dressed, smart in appearance; in style, cool.

Nghĩa · Tiếng Việt

Đẹp, thời trang; phong cách, cool

Machine-translated — suggest a fix

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

Topics: Dated

Common questions

What does “fly” mean?

Quick-witted, alert, mentally sharp.

Is “fly” formal or informal?

fly is generally dated, slang.

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