A person who secretly collects and reports information on the activities of another.

Multiple spies; individuals engaged in espionage.

जासूस लोग

English Usage: The government arrested several spies who were leaking classified information.

Hindi Usage: सरकार ने कई जासूसों को गिरफ्तार किया जो वर्गीकृत जानकारी लीक कर रहे थे।

To watch secretly; to observe in a covert manner.

Third person singular present of spy, meaning to watch secretly.

जासूसी करता है

English Usage: He spies on his friends to know their secrets.

Hindi Usage: वह अपने दोस्तों पर जासूसी करता है ताकि उनके रहस्य जान सके।