Flipper
a leg spin delivery with under-spin, so it bounces lower than normal, invented by Clarrie Grimmett. Floater
a delivery bowled by a spinner that travels in a highly arched path appearing to float in the air. Fly slip
a position deeper than the conventional slips, between the slips and third man. Follow on
a team which bats first in the second innings, after having batted second in the first innings, is said to have followed on. The captain of the team batting first in the first innings may direct the team batting second to follow on if it leads by a certain margin after the first innings; this margin is currently 200 runs in a five-day game, and 150 runs in a three- or four-day game. Follow through
a bowlers body actions after the release of the ball to stabilise their body. Footmarks
On a grass pitch, the bowler creates a rough patch where they lands their foot and follow through after delivering the ball. The rough patch can become cratered and becomes more abrasive as the match continues and more players step on it. The abrasive surface means that the ball will increasingly grip more if it lands in the footmarks. Bowlers, particularly spinners, will aim the ball there as it will turn more sharply, and is more likely to get irregular bounce from such areas, making it more difficult for the opposition batsmen.
3.  the act of excluding a player from selection in a squad even when they were included in the most recent prior selection. Dropper
Obsolete term for a delivery by lob bowling, or a bowler who employed this style. Common in the 19th century, this form of bowling is now usually illegal. Drop-in pitch
a temporary pitch that is cultivated off-site from the field which also allows other sports to share the use of the field with less chance of injury to the players. DRS
see Umpire Decision Review System

Duck
a batsmans score of nought (zero) dismissed, as in "he was out for a duck." It can refer to a score of nought not out during an innings, as in "she hasnt got off her duck yet", but never refers to a completed innings score of nought not out. Originally called a "ducks egg" because of the "0" shape in the scorebook. ( see Golden, Diamond, and Platinum duck )

Duck under delivery
a short pitched delivery that appears to be a bouncer, making the striker duck to avoid from being hit; but instead of bouncing high, it has a low bounce which causes the batsman to be dismissed LBW, or occasionally bowled. Duckworth-Lewis method (D/L)
(or Duckworth-Lewis-Stern method, DLS)
a rain rule used if a limited overs match is curtailed by bad weather. If the match cannot be completed, the Duckworth-Lewis method determines the winner, or if the match can be continued but needs to be shortened, it calculates a revised target for the team batting second.