noun
a device for securing a door, gate, lid, or container
verb
to secure or fasten with a lock
adverb
in a way that is securely fastened or sealed
preposition
used to indicate the action of securing or fastening something in place
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It is important to lock in your interest rate when applying for a mortgage.
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Make sure you lock in your spot for the concert before it sells out.
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I'm going to lock in some plans for this weekend with my friends.
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Once you make a decision, it's important to lock in your mindset and stay focused on your goal.