speculate on

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 ?
After five years' work I allowed myself to speculate on the subject, and drew up some short notes; these I enlarged in 1844 into a sketch of the conclusions, which then seemed to me probable: from that period to the present day I have steadily pursued the same object.
I followed rapidly until, darkness shutting down, I was forced to await the rising of the moon, and given an opportunity to speculate on the question of the wisdom of my chase.
Wilcox was alone hidden, and perhaps it is superstitious to speculate on the feelings of the dead.