noun
a mischievous imaginary creature that causes malfunctions in machinery
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The engineer discovered a gremlin in the aircraft's electrical system.
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I swear there's a gremlin in my computer causing all these glitches.
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That gremlin of a boss always finds a way to ruin my day.
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Procrastination is like feeding a gremlin - it only grows stronger the more you indulge it.