latch key

latchkey

[lach-kee]
noun, plural latchkeys.
a key for releasing a latch or springlock, especially on an outer door.

Origin:
1815–25; latch + key1

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World English Dictionary
latchkey (ˈlætʃˌkiː)
 
n
1.  a key for an outside door or gate, esp one that lifts a latch
2.  a.  a supposed freedom from restrictions
 b.  (as modifier): a latchkey existence

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