duplicate key
Backup door opener
A duplicate key is a copy of an original key, cut to match its pattern so both open the same lock.
Hardware stores and locksmiths make duplicate keys routinely: I had a duplicate key made for the babysitter.
In computing, a duplicate key is a repeated identifier in a database or data structure where uniqueness is expected, typically causing an error: The insert failed because of a duplicate key.
- copyIdentical reproduction made
- key copyReproduced lock opener
- spareHeld in reserve
- spare keyDuplicate for emergencies
- locksmithLock and key specialist
clone · replica · backup · keyring · key fob · lock · lock and key · cut · brass · master · identical · double · imprint · teeth · cylinder · security · unauthorized · lost
- keyscar key, house key, door key, master key, spare key
- system errorsconnection error, fatal error, timeout error, system crash, memory error
- doublesdouble, doubles, twin, twins, copy
- edge casesedge cases, special case, off-by-one, overflow, underflow
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