simple past tense and past participle of stiffen

(transitive) To make stiff. / (intransitive) To become stiff.

Anything added to something in order to stiffen it, such as a support beam, or starch for a collar. / (slang) An alcoholic drink taken to fortify oneself.

plural of stiffener

An item, material or feature that makes something stiffer.

present participle of stiffen

Third-person singular simple present indicative form of stiffen

plural of stiffening

simple past tense and past participle of stiffen up

(nautical, historical) A permission granted by the customs department to take cargo or ballast on board before the old cargo is out, in order to steady the ship.