1. a hole in a lock into which a key is inserted
2. a very small opening or narrow view

Examples

• She inserted the key into the keyhole and turned it.
• The old door had a large brass keyhole.
• He peeked through the keyhole to see who was outside.
• The keyhole was too small for the new key.
• Light streamed through the keyhole into the dark room.
• The detective examined the scratches around the keyhole.
• She could see only a keyhole view of the garden through the fence.