simple past tense and past participle of sign on

(transport) A collision where the front ends of two vehicles (such as ships, trains, cars, planes, etc.) hit each other, as opposed to a side-collision or rear-end collision.

(publishing) A system of printing very small runs of a document as required, especially by using computer technology.

On behalf of the (monetary) account of; (idiomatic, originally figuratively) for the sake of. / (idiomatic) Because of, due to, owing to.

(transitive, idiomatic) To take measures to stop something; to put an end to.

Alternative spelling of on hand

(of beer, etc.) Available directly from the barrel by way of a tap. / (by extension) Readily available; ready for use in whatever quantity is desired. / On an agenda, planned, expected.

Alternative spelling of print on demand

(informal, transitive) To get; to obtain; to secure. / To catch.

(games) A children's game involving pinning a piece of material on a specified spot while blindfolded. / (by extension) Any attempt to aim something somewhere while handicapped in doing so.