noun
a complex or confusing situation that is often illusory or imaginary
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The detective quickly realized that the supposed murder scene was actually a mare's nest of fabricated evidence.
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I thought I found a great deal on that used car, but it turned out to be a mare's nest of hidden problems.
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Don't believe everything she says, it's just a mare's nest of gossip.
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Trying to navigate through the complicated legal system felt like unraveling a mare's nest of red tape.