(colloquial, often ironic) A person who is intelligent, clever or quick-witted.

plural of spark knock

plural of bright spark

(transitive) to rekindle / (transitive) to make more exotic or fun / (intransitive) To light up; light a cigarette or start smoking a pipe, bong, etc.

(dated) spark plug

A method of determining the general classification of ferrous materials that normally requires taking a piece of metal, usually scrap, to a grinding wheel and observing the sparks emitted.

present participle of spark test

plural of spark gap

(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.

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.