speculate in (something)

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
Farlex Dictionary of Idioms.

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.
See also:
  • (Someone or something) called, they want their (something) back!
  • tomorrow
  • apply for Chiltern Hundreds
  • bushel
  • one rotten apple spoils the (whole) barrel
  • one rotten apple spoils the (whole) bushel
  • a bad apple spoils the (whole) barrel
  • a rotten apple spoils the (whole) barrel
  • a rotten apple spoils the (whole) bunch
  • a rotten apple spoils the (whole) bushel