the act of risking a sum of money or other stake on the forecast outcome of a future event, e.g. a race or contest, esp in competition with another or others
a stake so risked
a £10 bet
an outcome or result on which a stake is gambled
an opinion or belief
My bet is it will pour with rain
informal a plan of action; a course
a person or thing likely to be successful
informal a plan or course of action
Your best bet is to call a plumber
[origin unknown]