overspeculate

verb (used without object), spec·u·lat·ed, spec·u·lat·ing.

1. to engage in thought or reflection; meditate (often followed by on, upon, or a clause).
2. to indulge in conjectural thought.
3. to engage in any business transaction involving considerable risk or the chance of large gains, especially to buy and sell commodities, stocks, etc., in the expectation of a quick or very large profit.

verb

1. (when tr, takes a clause as object) to conjecture without knowing the complete facts
2. (intr) to buy or sell securities, property, etc, in the hope of deriving capital gains
3. (intr) to risk loss for the possibility of considerable gain
4. (intr) NZ rugby to make an emergency forward kick of the ball without taking any particular aim

v.1590s, back-formation from speculation. Related: Speculated; speculating.