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speculate about (someone or something)

To conjecture, hypothesize, or make guesses about someone or something without having supporting or conclusive evidence. We've all been speculating about the mysterious man who moved into the house two doors down. It's certain to be a gamble, but until we try it, all we can do is speculate about how the product will do on the market.
See also: speculate

speculate in (something)

To buy or sell some asset, such as commodities, securities, property, etc., at a risk while hoping to gain a profit from short-term market fluctuations. My uncle made, then promptly lost, a fortune speculating in oil wells in the 1980s. You'd be a fool to speculate in dairy in today's market.
See also: speculate

speculate on (something)

To conjecture, hypothesize, or make guesses about something without having supporting or conclusive evidence. You can't just speculate on what effect this legislation will have on the country—you've got to have some concrete data to show it will work! Instead of spending your energy speculating on the future, you should focus on the present and do what makes you happy.
See also: on, speculate
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

speculate about someone or something

to make guesses about someone or something; to hypothesize about someone or something. I refuse to speculate about Sally. I don't presume to guess what she will do. We don't speculate about the future.
See also: speculate

speculate in something

to make risky business deals in the buying and selling of something. Jeff made a fortune speculating in cotton. I do not wish to speculate in anything. It is too risky.
See also: speculate

speculate on something

to make a hypothesis about something. I really don't want to speculate on what might happen next. Would you care to speculate on what might happen if you quit your job?
See also: on, speculate
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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References in periodicals archive ?
After speculating that Education Secretary Leonor Briones remains 'very competent,' he speculates that she will do the right thing.
The attitude is, 'Let's wait and see once they get money,'" Sakellariou speculates.
However, he speculates, "fluorescence is likely to be a weak color cue compared to the visual signals reflected by pigments in full daylight."
Cook also speculates that Western Europe wheat output could be affected by the environmental movement, which may create a backlash against the high level of fertilizer used.
Because of the intense nature of a police interrogation, stressed truth tellers may display the same behaviors as liars do, Vrij speculates.
Thery speculates that the first dendritic cells to encounter an infectious microbe produce exosomes bearing microbial antigens as messages to other dendritic cells, sparking a chain reaction that amplifies and perhaps speeds the overall immune response.
Since MC1R resembles that protein, O'Brien speculates that thousands of years ago, an infectious agent that exploits the receptor caused an epidemic in jaguars and jaguarundi.
In accordance with that view, Payne speculates that early farmers in England primarily used milk to make lower-lactose dairy products, at least until widespread biological tolerance for the sugar had evolved.
The ants' three-lane system probably works better for them than a two-lane system would, speculates Couzin.
Short sleep may accelerate the onset of diabetes, Van Canter speculates. "If you are predisposed to diabetes, and you might become diabetic at 55, are you becoming diabetic at 45?" she asks.
Migeon speculates that Tsix controls imprinted, but not random, X inactivation.
Perhaps, Martin speculates, it was harder for the wolves to find large prey as the extinction event approached, so the animals shifted to eating smaller animals, which have less-tooth-damaging bones.
She speculates that their basic odor still identified them as belonging to the colony.
26, 2001 SCIENCE, Ruvkun speculates that "the number of genes in the tiny RNA world may turn out to be very large, numbering in the hundreds or even thousands in each genome.
Kirkland describes the new predator, a yet-unnamed type of Coelurosaur, as "the coyote of the Cretaceous." Like coyotes, he speculates, it consumed a variety of prey.