One of the slang names for the workhouse, along with Spike, Bastille etc. presumably derived from grub — a slang term for food.
A bowling delivery that stays very low after leaving the surface of the pitch.
a ball bouncing close to the ground after being kicked. Notoriously hard to judge and catch.
A ball that hardly bounces - see also shooter
A delivery that keeps low after leaving the bowler's hand. So called because it inches along the ground - and then turns into a butterfly. OK, we made that last bit up.
a ball that bounces unusually low off the pitch, often causing difficulties for the batsman to play at it successfully.