verb
past tense of the verb 'spike', which means to increase or rise sharply and suddenly
adjective
describing something that has a spiked shape or appearance
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The scientist discovered that the levels of carbon dioxide in the atmosphere had spiked dramatically.
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I heard that ticket prices for the concert spiked after the band announced a surprise guest.
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I can't believe how much the price of gas spiked overnight!
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Her heart rate spiked when she saw her ex-boyfriend at the party.