Question: A progressive parlay is a joint wager on multiple events, for example team sports or horse races, however, unlike a regular parlay, if some of the individual bets lose, but most win, the bettor still wins, although with a much smaller payout, what is called, an accumulator, or combo bet is a single bet that links together two or more individual wagers and is dependent on all of those wagers winning together?
Context: 'Due-column Betting' (also: 'due column betting') is a type of fixed-profit betting strategy whereby a bettor increases the amount he wagers on a single proposition after each successive loss.  According to this system, the bettor determines a target profit before he begins betting.  Then he increases his bet on propositions following a loss in such a way that a win will recover the sum of all amounts he lost from his preceding bets plus gain him his predetermined profit. In organized sports, point shaving is a type of match fixing where the perpetrators try to prevent a team from covering a published point spread.  Unlike other forms of sports betting, spread betting invariably motivates point shaving.  A point shaving scheme generally involves a sports gambler and one or more players of the team favored to win the game.  In exchange for a bribe, the player or players agree to ensure that their team will not "cover the point spread" (i.e. the bribed player's team may still win, but by not as big a margin as predicted by oddsmakers).  The gambler then wagers against the bribed team.  Alternatively, an official (referee) of the game may be bribed, or even bet on his own behalf, so that one or more "close calls" will be called in favor of the "underdog" rather than the team favored to win. A progressive parlay is a joint wager on multiple events, for example team sports or horse races.  Generally a progressive parlay involves a joint wager on four to twelve separate events.  Should all the selected bets win, the bettor receives a relatively large payout, because of the sizable odds against this happening.  However, unlike a regular parlay, if some of the individual bets lose, but most win, the bettor still wins, although with a much smaller payout.  Several sites use a schedule where the bettor can lose one bet on a 4-6 event progressive parlay, can lose up to two bets on a 7-9 event progressive parlay, and up to three bets on a 10-12 event progressive parlay. An over–under or over/under (O/U) bet is a wager in which a sportsbook will predict a number for a statistic in a given game (usually the combined score of the two teams), and bettors wager that the actual number in the game will be either higher or lower than that number.  For example, in Super Bowl XXXIX, most Las Vegas casinos set the over–under for the score of the game at 46.0.  A bettor could wager that the combined score of the two teams would be either more than or less than that number.  Since the combined score of that game was 45, anyone who had bet on "under" won. Advance-deposit wagering (ADW) is a form of gambling on the outcome of horse races in which bettors must fund their account before being allowed to place bets.  ADW is often conducted online or by phone.  In contrast to ADW, credit shops allow wagers without advance funding; accounts are settled at month-end.  Racetrack owners, horse trainers and state governments sometimes receive a share of ADW revenues. In a fixed-limit poker game, a big bet (BB) is the larger of two fixed bet amounts.  A big bet is used in the final rounds of a game to increase the pot amount and thereby enable the possibility of a bluff.  Big bets are generally double the wager of the initial or "small bet".  Any multi-round poker game can use big bets to standardize wagers while maintaining a sufficient risk-ratio to encourage bluffing.  Casino poker tables use big bets to set a limit to the amount of money a patron can lose in each wager. A teaser (or a "two-team teaser") is a type of gambling bet that allows the bettor to combine his bets on two different games.  The bettor can adjust the point spreads for the two games, but realizes a lower return on the bets in the event of a win. Oscar's Grind is a betting strategy used by gamblers on wagers where the outcome is evenly distributed between two results of equal value (like flipping a coin, betting on red or black in roulette, etc.).  It is an archetypal positive progression strategy.  It is also called Hoyle's Press.  In German and French it is often referred to as the Pluscoup Progression.  It was first documented by Allan Wilson in his 1965 book,"The Casino Gambler's Guide".  This progression is based on calculating the size of bets so that in the event of a losing streak, if and when a same-length winning streak occurs, a profit is obtained.  The main concept is that there are periods of many wins and periods of many losses.  Losses and wins often come in streaks.  Ideally, bets are kept low on losing streaks and increased on winning streaks, which hopefully will follow. A parlay, accumulator, or combo bet is a single bet that links together two or more individual wagers and is dependent on all of those wagers winning together.  The benefit of the parlay is that there are much higher payoffs than placing each individual bet separately since the difficulty of hitting it is much higher.  If any of the bets in the parlay lose, the entire parlay loses.  If any of the plays in the parlay ties, or "pushes", the parlay reverts to a lower number of teams with the odds reducing accordingly. An each-way bet is a wager offered by bookmakers consisting of two separate bets: a win bet and a place bet.  For the win part of the bet to give a return, the selection must win, or finish first, in the event.  For the place part of the bet to give a return, the selection must either win or finish in one of the predetermined places for the event, such as first place or second place.  The odds paid on the place part of the bet are usually a fraction (commonly ⁄ , ⁄ , ⁄ or ⁄ ) of the win odds.  The trade-off being that one has a greater chance of making one's bet in trade for getting less payoff for doing so.  Examples are domestic football knockout competitions (e.g. FA Cup) where the quoted place terms may be ⁄ .
Answer: parlay