to spy
verb/ɨʃpiuˈnaɾ/medium
es·pi·o·nar
Definition
To observe or gather information secretly and clandestinely, usually for political, military, or economic purposes.
The agent was sent to spy on the enemy's communications.
She felt like her neighbours were spying on her.
Common collocations
to spy on the enemyto spy on conversationsto engage in espionage
Etymology
Do francês 'espionner'.