As nouns the difference between lockin and lockup
is that lockin is an alternative spelling of lock in while lockup is a jail, prison.
lockup
English
Noun
(
en noun)
(slang) A jail, prison.
:He's in lockup for 30 days for drunk and disorderly.
(UK, chiefly) A storage unit with a door secured by a padlock or deadbolt; a garage
:Joe keeps his other car in a lockup downtown.
Anagrams
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