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spark spread
(idiomatic) The difference between the cost of the fuel required to produce a unit of electricity, and the price of that same unit of electricity.
spark plug
The part of an internal combustion engine which forms a high-voltage electric spark which ignites the fuel-air mixture to begin the power stroke.
spark knock
The sound produced, in an internal combustion engine, by the ignition of the fuel-air mixture before the piston reaches top dead centre
spark gap
A gap, between two electrical terminals, across which sparks are generated. / Such a gap as a component of an engine's ignition system, especially that between the electrodes of a spark plug.
spark arrestors
plural of spark arrestor
jump spark
A spark produced by the jumping of electricity across a permanent gap.
spark coil
An induction coil used for producing sparks, as in an internal combustion engine. / A self-induction coil used to increase the spark in an electric gas-lighting apparatus.
spark coils
plural of spark coil
spark off
(transitive) To initiate something by providing the necessary conditions.
（ present singular third-person ）
（ participle present ）
（ participle past ）
（ past ）
