Underlay

A bad or unfavorable bet. An event that has more money bet on its happening than can be justified by the probability of it happening.

"An Underlay is not a bet of choice."

Unit

Used to express the smallest wager without actually referring to the dollar value.

"I threw in 5 Units which was five chips or 5 dollars."

Upcard

the first card the Blackjack dealer deals himself that he places face-up for all players to see before they play their hands. The player's decision to draw or stand involves some consideration of the dealer's up card.

"The Updcard helps determine how your game is going to go."