steel

(noun) an alloy of iron with small amounts of carbon; widely used in construction; mechanical properties can be varied over a wide range.

(noun) a cutting or thrusting weapon that has a long metal blade and a hilt with a hand guard. Synonyms: sword, blade, brand.

(noun) knife sharpener consisting of a ridged steel rod.

(verb) get ready for something difficult or unpleasant. Synonyms: nerve.

(verb) cover, plate, or edge with steel.