diligent study; devoting oneself to one's studies

striking sparks with flint and steel or by rubbing sticks together (usu. to start a fire); fire lit by sparks from flint and steel, etc.

purification ceremony in which sparks are struck in the direction of someone (oft. for good luck)

Rare term

to start a fire (with wood-wood friction or by striking metal against stone)

boring machine; punching machine; perforator