185 entries under expression topic. ×

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secretly follow(verb, discover, eyeball, pry)
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signal post(idiom, warning)
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skin flick(idiom, the drama)
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special agent
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special assignment
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special correspondent(idiom, messenger)
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spy plane(idiom, warning)
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squint at(verb, look, scrutinize, stare)
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steal a glance
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steer clear of(idiom, mind, avoid, heed)
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subsonic aircraft(idiom, ship)
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supersonic aircraft(idiom, ship)
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take care(verb, mind, notice, spot)
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take heed(mind, avoid, heed)
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take in the sights(verb, idiom, study, consider)
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take into consideration(verb, idiom, mark, see)
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take note of(verb, idiom, note, regard)
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tell on(verb, phrasal verb)
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think about(verb, consider, regard, perceive)
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under cover(adjective, secret, covert, undercover)
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APASmart Define. (2016). spy thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/spy/thesaurus/synonyms
ChicagoSmart Define. 2016. "spy thesaurus" https://smartdefine.org/spy/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, spy thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/spy/thesaurus/synonyms>.
MLASmart Define. "spy thesaurus" 10 February 2016. Web. 23 September 2026. <https://smartdefine.org/spy/thesaurus/synonyms>