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guard lock

noun
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Definition of guard lock

1 : a tide lock at the mouth of a dock or basin or a lock for preventing flooding of a canal
2 : a lock guarding the keyhole or bolt of another lock and having to be unlocked before the key of the main lock can be operated

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“Guard lock.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/guard%20lock. Accessed 18 Jun. 2021.

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