spy

1 of 2

verb

ˈspī 

spied; spying

transitive verb

1

: to watch secretly usually for hostile purposes

There is a story that Washington … sat with his glass, spying the movements across the water in Boston.

—Horace E. Scudder

2

: to catch sight of : see

spied her friends in the crowd

3

: to search or look for intensively

—usually used with out

… spy out places fit for vending … goods …

—Samuel Eliot Morison

intransitive verb

1

: to observe or search for something : look

2

: to watch secretly as a spy

spying for the government

—often used with on

spying on a rival company

spy

2 of 2

noun

plural spies

1

: one that spies:

a

: one who keeps secret watch on a person or thing to obtain information

b

: a person employed by one nation to secretly convey classified information of strategic importance to another nation

also : a person who conveys the trade secrets of one company to another

2

: an act of spying

Synonyms of spy

Verb

• spot
• eye
• notice
• see
• regard

Noun

• operative
• agent
• undercover
• mole

Examples of spy in a Sentence

Verb

They were accused of spying for a foreign government.

I spy a motel off in the distance, so let's spend the night there.

Noun

He was a spy for the CIA.

My coworker is a spy for the boss.

Recent Examples on the Web

Verb

To support their request to detain Alfozan, the government pointed to a case where former Twitter employees were charged with spying for the Saudi government. — Ashley Belanger, ArsTechnica, 19 Oct. 2026

For additional privacy guidance, see our CyberGuy article, Are Apple devices spying? — Kurt Knutsson, FOXNews.com, 15 Oct. 2026

Noun

The head of the Australian Security Intelligence Organisation spy agency, Mike Burgess, on Tuesday reiterated an earlier warning that politically motivated violence was a top security concern, along with espionage and foreign interference. — ABC News, 20 Oct. 2026

The head of the Australian Security Intelligence Organization spy agency, Mike Burgess, on Tuesday reiterated an earlier warning that politically motivated violence was a top security concern, along with espionage and foreign interference. — Rod McGuirk, Los Angeles Times, 20 Oct. 2026

Word History

Etymology

Verb

Middle English spien, from Anglo-French espier, of Germanic origin; akin to Old High German spehōn to spy; akin to Latin specere to look, look at, Greek skeptesthai & skopein to watch, look at, consider

First Known Use

Verb

13th century, in the meaning defined at transitive sense 1

Noun

13th century, in the meaning defined at sense 1

Phrases Containing spy

• spy on
• spy out
• spy out the land

Rhymes for spy

• ai
• aye
• bae
• bi
• buy
• by
• bye
• chai
• chi
• cry
• die
• dry

Kids Definition

spy

1 of 2 verb

ˈspī 

spied; spying

1

: to watch, inspect, or examine secretly : act as a spy

2

: to catch sight of : see

spied a friend in the crowd

spy

2 of 2 noun

plural spies

1

: one that watches the movement or actions of others especially in secret

2

: a person who tries secretly to obtain information for one country in the territory of another usually unfriendly country