finger trouble n.— «It was an assembly error in the car’s in-line six that led to a blow-up and fire as one of the conrods left the scene of the crime through the side of the engine block. Race teams put such failures down to...
shack n. a direct hit on a target by a bomb or missile. Etymological Note: Perhaps from the actual shacks—‘rude cabins or huts’—used in live-fire target practice. (source: Double-Tongued Dictionary)

