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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: speculate
References in classic literature ?
I could only speculate on the cause of Parthak's removal, but that it was connected in some way directly with the note I had given him was most apparent to me.
But in Naples I think they speculate on misfortunes of that kind.
He had as much right as anybody else to speculate upon the admiration and curiosity of his contemporaries.
When, with closed eyes, she commenced to speculate upon the future, and terrifying fears were conjured by a vivid imagination, she had but to raise her lids and look upon that noble face so close to hers to dissipate the last remnant of apprehension.
They will be struck by the wonderful depth of the colour on the nose, and speculate as to how beautiful the bit of the tail that is lost no doubt was.
Katharine stirred her tea, and seemed to speculate, so Denham thought, upon the duty of filling somebody else's cup, but she was really wondering how she was going to keep this strange young man in harmony with the rest.
From its construction Carthoris could but dimly speculate upon its unthinkable antiquity.
As I proceeded I began to speculate upon the possible actions of Raja when we should enter the presence of other men than myself.
He wondered if she knew how Tarzan felt toward her and then he himself began to speculate upon the truth of the ape-man's charges.
Then we began to speculate as to whether it had been an ape-man or a Prussian that had abducted Lys.
I intended you to speculate, and you did speculate.
In a pampero off the River Plate we speculate, if we are disabled, of running in to Buenos Ayres, the "Paris of America," and I have visions of bright congregating places of men, of the jollity of raised glasses, and of song and cheer and the hum of genial voices.
Speculate comes from the Latin speculari, to spy out.
It would be idle to speculate as to the date of this work.
The fate of the relinquished provinces which lay beyond the dead lines we could only speculate upon.