lock, fetters, shackles
錠 centers on a metal device that secures or restrains: a lock that keeps things closed, or fetters and shackles that bind movement.
錠 combines 金 (metal) with 定, which likely contributes the sound and the idea of fixing or securing something in place. The lock and shackle meanings follow naturally from a metal object that holds things fast.
The metal radical 金 on the left suggests something made of metal. The right side 定 looks like a roof over a person, giving the idea of something fixed in place. Together, 錠 is a metal device that fixes things shut or holds them still: a lock or shackles.
For ジョウ, imagine a giant metal lock on a door, and you say 'Joe, lock it!' Joe -> ジョウ, and the metal lock clicks shut.
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lock; padlock
pill; lozenge; tablet
handcuffs; manacles
locking
padlock
lock
cylinder lock
one tablet; one pill
stomach tablet
buckle
door separating the inner castle from the outer castle (Edo period)
bolt
combination lock
lock with a curved shape resembling a shrimp (used for gate bolts)
destroying a lock
sugar-coated pill
combination lock
vaginal tablet
sublingual tablet
auxiliary lock; supplementary lock