Spy/spaɪ/ Definition 1 of 3Pro Tip 1/3Secret Profession Used for someone whose job is to collect secret information, often in covert operations. She became a spy to help uncover enemy secrets. Pro Tip 2/3Linked with Danger 'Spy' often implies a level of danger and risk, especially in times of conflict. The spy risked his life infiltrating the hostile territory. Pro Tip 3/3Double Agent A spy can pretend to work for one side while actually working for the other. The double agent passed secrets to the enemy.