To fasten or secure something with a lock. She locked the door before leaving the house.
To become fixed or immovable. The wheels locked, causing the car to skid.
To engage in a struggle or conflict. The two teams locked in a fierce battle for the championship.
To restrict access to a computer or device by requiring a password or other authentication. He locked his phone to prevent unauthorized access.
A device used for securing a door, gate, lid, drawer, or other opening, typically operated by a key or combination. She turned the key in the lock to secure the front door.
A section of a canal or river that is enclosed by gates and used to raise or lower boats from one water level to another. The boat entered the lock to be lifted to the higher water level of the canal.
A mechanism for keeping a firearm's hammer in place until it is released by the trigger. The hunter checked the lock on his rifle before setting out.
A secure hold or grip, especially in wrestling. The wrestler had his opponent in a tight lock, making it difficult for him to escape.
A tuft or small group of hairs or fibers that are held or grow together. She tucked a loose lock of hair behind her ear.
A mechanism in computing that restricts access to a resource, preventing simultaneous use or modification. The database lock prevented two users from editing the same record at once.
Informal: something regarded as certain to happen or to succeed. With their current lead, the team's victory is a lock.