DEFINITION of 'DownandOut Option'
A type of knockout barrier option that ceases to exist when the price of the underlying security hits a specific barrier price level. If the price of the underlying does not reach the barrier level, the investor has the right to exercise their European call or put option at the exercise price specified in the contract.
INVESTOPEDIA EXPLAINS 'DownandOut Option'
For example, a downandout option has a strike price of 100 and a knockout price of 80. At the option's inception the price of the stock was 95 but before the option was exercisable the price of the stock hit 80, this means the option automatically expires worthless even if the underlying hits 100 before the exercise date.
RELATED TERMS

Barrier Option
A type of option whose payoff depends on whether or not the underlying ... 
European Option
An option that can only be exercised at the end of its life, ... 
Option
A financial derivative that represents a contract sold by one ... 
KnockOut Option
An option with a built in mechanism to expire worthless, should ... 
DownandIn Option
A form of barrier option that becomes activated only if the price ... 
Exotic Option
An option that differs from common American or European options ...
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