bet-v; 2 Senses

Sense Number 1: stake money or something of value on the outcome of an issue

Commentary: Includes: BET ON
NOTE: this may be interpreted as a subset of sense 2; if money is involved this sense should be chosen (naturally, the better may often feel certain that what they are betting on is true or will occur)
NOTE: this is only if money or valuable item is wagered or gambled

I bet you $10 you can't lift that rock.
He regularly goes to the races and bets heavily.
I bet you my blue marble that I'll get there before you.
I'm betting on the new horse.

VerbNet: bill-54.5,risk-94
FrameNet: NP
PropBank: bet.01
WordNet 3.0 Sense Numbers: 2
WordNet Verb Particle Constructions, Multiword Expressions:
bet_on 1

Sense Number 2: express certainty (or take action on the assumption) that something is true

Commentary: No gambling is implied. No money or goods are wagered. The subject is usually (but not always) in 1st person.

I bet she's missed the bus.
I bet (you) that he won't come.
I bet he's forgotten to bring the keys.
You bet!

VerbNet: rely-70
FrameNet: NP
PropBank: bet.01
WordNet 3.0 Sense Numbers: 1, 3