wager >> ˈweɪdʒə
Definition: [verb] risk (a sum of money or valued item) against someone else's on the basis of the outcome of an unpredictable event; bet.
Example: a total of $770,700 was wagered by fans at other sites on the track
Definition: [verb] used to express certainty.
Example: I'll wager she makes that trip to Virginia
Definition: [noun] an act of betting a sum of money on the outcome of an unpredictable event.
Example: they have made a wager on who will win tonight