Keyhole/ˈkiːhəʊl/ Definition 1 of 3Pro Tip 1/3Privacy Intrusion Looking through a keyhole can imply invading someone's privacy or spying. He felt guilty for peeping through the keyhole at the private gathering. Pro Tip 2/3Metaphor for Mystery The keyhole can symbolize a gateway to something unknown or mysterious. This diary is a keyhole to her innermost thoughts. Pro Tip 3/3Slang Usage In some contexts, 'keyhole' can be used as slang to mean an opportunity or chance. He saw the job opening as a keyhole into the industry.