This is the 13339th most frequent Turkish word.
kilitledi
"Kilitledi" means "locked."
In this sentence, 'kilitledi' is the verb meaning 'locked' referring to the action of locking a door.
Kapıyı kilitledi.
He/she locked the door.
Here, 'kilitledi' is used metaphorically to mean concentrating or focusing intensely, as one’s attention is ‘locked’.
Onun dikkati, filme kilitledi.
His/her attention was locked onto the movie.
This context uses 'kilitledi' in a conditional construct, indicating the safe gets locked automatically.