spy on sb/sth
— phrasal verb with spy uk/spaɪ/us/spaɪ/verb
C2 to watch someone or something secretly, often in order to discover information about him, her, or it:
He was spying on her through the keyhole.
Thesaurus: synonyms and related words
International relations: spying and espionage
- agent
- agent provocateur
- counter-espionage
- counterintelligence
- deep state
- intelligence
- MI5
- MI6
- on the inside idiom
- operative
- phone tapping
- scout
- snoop
- spook
- spy
- tail
- tap
- the CIA
- wired up
- wiretap
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