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spy

2 ENTRIES FOUND:
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1spy/ˈspaɪ/noun
pluralspies
1spy
/ˈspaɪ/
noun
pluralspies
Learner's definition of SPY  
[count]
: a person who tries secretly to get information about a country or organization for another country or organization — often used before another noun
: someone who secretly watches the movement or actions of other people
2spy/ˈspaɪ/verb
spiesspiedspying
2spy
/ˈspaɪ/
verb
spiesspiedspying
Learner's definition of SPY  
[no object]  : to try secretly to get information about a country, organization, etc. : to act as a spy — often + on
[+ object]  : to see or notice (someone or something)

spy on

[phrasal verb]
spy on (someone or something) 
: to watch (someone) secretly
— see also 2spy 1 (above)

spy out

[phrasal verb]
spy (something) out or spy out (something)  : to notice, find, or learn about (something) by looking often in a secret way
spy out the landchiefly British  : to find or get more information about a situation secretly and before making a decision
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