speculate in

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
References in classic literature ?
This is one of the peculiarly dangerous months to speculate in stocks in.
My "Scenes of Modern Prison Life" had not sold so well as had been anticipated, and my publisher was gruffly disinclined to speculate in any future works done in the same style.