[four corners] {n.} All parts of a place. * /People came […]

[four-eyes] {n.}, {slang} A person who wears glasses. - A rude […]

[four-leaf clover] {n.} A small green plant with four leaves which […]

[fourth class] {n.} A class of mail that is not sealed […]

[fourth world] {n.}, {informal} The poor nations of the world, as […]

[fourth-class(1)] {adj.} Belonging to the fourth class of mail. * /The […]

[fourth-class(2)] {adv.} By fourth-class mail. * /How did the company mail […]

[fowl] See: [NEITHER FISH NOR FOWL].

[fox and geese] {n. phr.} A tag game in which the […]

[FP] "First post"; originally used on Slashdot