Ignorant End
The bottom end of a straight that can be costly if another player holds the higher end of the straight. For instance, a player that holds 6-7 on a flop of 8-9-10 has the bottom or ignorant end of the straight, which leaves them drawing dead to any player holding Q-J.
Implied Odds
The pot odds that a player is not currently getting in relation to the amount of money in the pot during a hand, but may expect to get from future bets assuming that they make their hand.
Inside Straight
A situation where a player has four cards to a straight and needs one of the middle cards to complete it, such as holding 10-J on a 2-Q-8 board. Often players do not have the correct pot odds to draw to an inside straight, so it is usually best to play them only when there is a large amount of money in the pot.