23 entries under expression topic. ×

6
undercover work(noun, idiom, pursuance, meddling)
1
body mike(bug, scrutiny, investigation, monitor)
1
close observation(bug, scrutiny, investigation, monitor)
1
eagle eye(bug, scrutiny, investigation, monitor)
1
peeled eye(bug, scrutiny, investigation, monitor)
0
becoming infected
0
detective work
0
dig up(verb, phrasal verb)
0
fact finding(watching, voyeurism)
0
ferret out(verb, phrasal verb)
0
find oneself
0
find out(verb, phrasal verb)
0
get a line
0
get hold
0
get wind
0
intelligence activity
0
intelligence operation
0
investigate a crime
0
military espionage
0
police investigation
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APASmart Define. (2015). spying thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/spying/thesaurus/synonyms
ChicagoSmart Define. 2015. "spying thesaurus" https://smartdefine.org/spying/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, spying thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/spying/thesaurus/synonyms>.
MLASmart Define. "spying thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/spying/thesaurus/synonyms>