One-day cricket
an abbreviated form of the game, with just one innings per team, usually with a limited number of overs and played over one day. One Day International (ODI)
a match between two national sides limited to 50 overs per innings, played over at most one day. One down
a batsman who bats at No. 3 i.e. when the team is "down by one wicket", a crucial position in the teams batting innings. One short
when a batsman fails to make contact with the ground beyond the popping crease, and turns back for an additional run. Opener
1.  an opening batsman
2.  an opening bowler

Opening batsman
One of the two batsmen who are in at the start of the innings. They must face the opening bowlers and new ball, so require good defensive technique to avoid getting out, especially in a timed match. In a limited overs match an opening batsman must also score quickly during the power play. Opening bowler
One of the two bowlers who begin the innings using the new ball. They are usually the fastest or most aggressive bowlers in the side. Opposite number
A player on the other team who plays the same role. Often used for captains and wicket keepers. Orthodox
1.  shots played in the accepted "textbook" manner, and batsmen who play in this manner. 2.  see left-arm orthodox spin. Out
1.  the state of a batsman who has been dismissed.
Dead bat
A defensive shot with the bat held in a loose grip and/or angled towards the ground. If the ball strikes the bat it loses momentum and falls quickly to the ground. Used to reduce the chance of being caught off an edge. Dead rubber
A match played in a series after one side has gained an unassailable lead, e.g. has already won 3 matches in a 5-match series, or in a tournament if both teams have already qualified (or failed to qualify) for the subsequent rounds. The term is used disparagingly to imply that the match is of lesser importance, but some regard the concept as outdated. Death bowler
A bowler who specialises in delivering the death overs at the end of a limited overs match. Because batsmen usually play very aggressively in this period, a death bowler must be particularly skilled at variations which are difficult to score from and/or unexpected by the batsman, such as yorkers and slower balls. Death overs
(or slog overs)
The final few overs of an innings in a limited overs match. Because only runs matter in determining the result, a batting side with wickets in hand will bat very aggressively in this period, seeking to hit every delivery for a boundary, even if it risks a dismissal. Typically the batting strike rate is highest in this period, and the bowlers economy is poorest. Death rattle
The sound of the ball breaking the wicket when a batsman is out bowled. Debenture
a certificate of loan agreement, used by some professional clubs to raise funding.