noun
a lack of reserve or restraint
verb
to release or free from reserve or restraint
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The hotel requires guests to unreserve their rooms at least 24 hours in advance to avoid any cancellation fees.
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I forgot to unreserve the conference room for tomorrow's meeting, can you help me with that?
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I accidentally double-booked my flight, so I had to unreserve one of the tickets.
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She decided to unreserve her feelings and finally open up to her therapist about her struggles.