Doosra

A deceptive delivery bowled by an off-spinner that turns the opposite way to their stock ball — away from a right-handed batter instead of into them — by disguising the wrist and finger action at release. "Doosra" literally means "the other one" in Hindi/Urdu, which is exactly what it is: the off-spin equivalent of a googly. It's one of the hardest deliveries in cricket to pick out of the hand, because a well-disguised doosra looks identical to the bowler's normal off-break until it's already turning the wrong way. That difficulty is also why it's controversial — the wrist and elbow mechanics needed to bowl a genuine doosra have put several bowlers under scrutiny for illegal bowling actions over the years. When it works, it's one of the most unplayable deliveries in the sport; when it's telegraphed, batters simply leave it alone. ESPNcricinfo has detailed technical breakdowns of how the doosra is actually bowled.