1. a device used to secure doors, containers, or other objects, typically operated by a key
2. a section of a canal or river with gates at each end where the water level can be changed to raise or lower boats
3. a strand or curl of hair

1. to fasten or secure with a lock
2. to become fixed in position and unable to move

Examples

• She turned the key in the lock.
• The boat passed through the lock on the canal.
• A lock of hair fell across her face.
• Don’t forget to lock the door when you leave.
• The wheels locked and the car skidded.
• He locked the safe before going home.
• The computer screen locked after ten minutes of inactivity.
• Golden locks framed her face beautifully.