spy on

Idioms  

1. Secretly or furtively observe someone or something, as in The children loved spying on the grownups, or The company sent him to spy on the competitor's sales force. [Early 1600s]

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Example Sentences

Scientists gave householders wildlife cameras to spy on hedgehogs in more than 400 gardens in Chester in one of the largest studies of its kind.

From BBC

Some security officials and lawmakers fear that technologies that allow the cranes to be programmed and controlled remotely could allow China to spy on ports or shut ports down in time of war.

From The Wall Street Journal

Israeli companies also export cyber weapons such as NSO’s Pegasus, which allows clients to take control over smartphones remotely to spy on targets.

From The Wall Street Journal

They also said the Roomba would enable Amazon to hoover up data and spy on Americans.

From The Wall Street Journal

Anchored by Bollywood star Ranveer Singh's swaggering performance as Hamza, an Indian spy on a perilous mission in Karachi in Pakistan, the film traces his battles against criminal networks, shadowy operatives and personal demons - all framed against the backdrop of India-Pakistan tensions.

From BBC

Related Words

• stalk