Main entry: lock
Definition: become rigid or immoveable
Usage: The therapist noticed that the patient's knees tended to lock in this exercise
Antonyms: unlock
Definition: become unlocked
Main entry: lock
Definition: fasten with a lock
Usage: lock the bike to the fence
Main entry: lock, mesh, operate, engage
Definition: keep engaged
Usage: engaged the gears
Definition: release from something that holds fast, connects, or entangles