speculate on
Definitions
To form a theory or conjecture about a subject without firm evidence.
To engage in a risky financial transaction in the hope of significant profit.
Examples
It is pointless to speculate on the outcome of the election before all the votes are counted.
The scientists began to speculate on the origins of the mysterious signal detected from deep space.
Synonyms
conjecture about theorize about ponder gamble on hazard a guess mull over