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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

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
References in classic literature ?
How could I speculate when I already have so much trouble in regulating my income?
The fate of the relinquished provinces which lay beyond the dead lines we could only speculate upon.
Managing women, the ornaments of their sex--women who order everything for everybody, and know so much better than any person concerned what is good for their neighbours, don't sometimes speculate upon the possibility of a domestic revolt, or upon other extreme consequences resulting from their overstrained authority.
For example, a user speculates $100 that the Google share price will be lower than the current price displayed on Yalla
The paper speculates it is uncertain whether it would be held by the end of this year, because of BDI's failure to keep its promises about Macedonia's EU integration, establishing diplomatic relations with Kosovo, solving the status of the members of the NLA and the problems relating to the use of the Albanian language.
To Michiels, the prospects for creatures living this way look so perilous that he speculates that they're headed for "an evolutionary dead end.
The author describes the situation or event as it happened, and then he speculates on what might have happened if conditions had been altered.
The team speculates on the biological mechanism behind the observed effects, laying the groundwork for future research.
Long-Irwin speculates that future investment opportunities in Thunder Bay-may be found in the bio-medical field, education and training and tourism.
He speculates on why the gifted son found an entirely different musical path.
Foster speculates that sexual harassment might have driven females to avoid the male-dominated turf.
It's very likely that [senile plaques] can be bioactive; they've been seen attached to the sides of nerve cells, but the damage they cause is probably limited," says Klein, who further speculates, "The ADDLs are much more insidious because they diffuse between cells until they find just the right target.
Lecoq speculates that new opportunities for trade will emerge even further south with the signing of a trade agreement between Canada, the U.