bet1 S1 past tense and past participle bet, present participle betting
1 [intransitive and transitive]DGG
to risk money on the result of a race, game, competition, or other future event [↪ gamble]:
How much do you want to bet?
bet (somebody) that
He bet me £10 that I wouldn't do it.
bet (something) on something
She bet all her money on a horse that came last.
I wouldn't bet against him winning the championship this year.
2, I'll bet spoken
used to say that you are fairly sure that something is true, something is happening etc, although you cannot prove this:
Bet you wish you'd arrived earlier.
I bet you she won't come.
used to show that you understand or can imagine the situation that someone has just told you about:
'God, I was so angry.' 'I bet you were.'
'It makes things much easier.' 'Yeah, I'll bet it does.'
used to show that you do not believe what someone has just told you:
'I'm definitely going to give up smoking this time.' 'Yeah, I bet!'
used to emphasize that you agree with someone or are keen to do what they suggest:
'Going to the party on Saturday?' ' You bet!'
used when you are sure that you know what someone will do or what will happen:
You can bet your bottom dollar he won't be back.
used to say that you think something that someone has just said is not true or not likely to happen:
'I'm sure Tom'll be here soon.' 'Wanna bet?'
6, I wouldn't bet on it spoken
used to say that you do not think something is likely to happen:
He said he'd finish by tomorrow, but I wouldn't bet on it.