Noun
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a commercial undertaking that risks a loss but promises a profit
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an investment that is very risky but could yield great profits
"he knew the stock was a speculation when he bought it"
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any venturesome undertaking especially one with an uncertain outcome
Verb
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put at risk
"I will stake my good reputation for this"
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put forward, of a guess, in spite of possible refutation
"I am guessing that the price of real estate will rise again"
"I cannot pretend to say that you are wrong"
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proceed somewhere despite the risk of possible dangers
"We ventured into the world of high-tech and bought a supercomputer"