(construction) A length of lumber having a cross section of two inches by four inches, or in the case of dimensional lumber three and a half inches by one and a half inches.

measuring two inches by four inches / (by extension) small or cramped

(US, informal) costing 25 cents / (US, idiomatic, slang) insignificant or worthless

A vehicle with seats for two people (a driver or pilot and one passenger)

A ballroom dance in duple time, having long, sliding steps / A piece of music for this dance

plural of two-by-four

Obstructed from proceeding.

A sail warship, which carried her guns on two fully-armed decks. Usually additional guns were carried on the upper works (forecastle and quarterdeck) but this was not a continuous battery so was not counted. Two-deckers ranged all the way from the small 40-gun fourth-rate up to 80- or even 90-gun ships, with the third-rate or "seventy-four" being the archetype.

Synonym of Mesopotamia. / A census-designated place in Fairbanks North Star Borough, Alaska. / An unincorporated community in Plumas County, California.

(euphemistic, usually childish) Feces; the act of defecation. / (nautical, slang) A first mate. / A primary assistant; vice-leader.