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This is not a very popular term, which is more often used by professional players and experienced customers. It is most common in the field of betting. 


Underlay – unprofitable bet for the player, the payment of which is lower than the expected probability. 

There are special calculators that allow you to identify bets – underlay. They are presented in the form of online utilities on specialized sites or in the format of individual applications that require installation.

The antonym of this term is the word "overlay". 

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