[fifth column] {n. phr.} A group or organization within a country […]

[fifty-fifty] (2) {adj.}, {informal} 1. Divided or shared equally. * /It […]

[fight against time] See: [RACING TO STAND STILL].

[fight fire with fire] {v. phr.}, {slightly formal}, {of Biblical origin} […]

[fight it out] See: [SLUG IT OUT].

[fight off] {v. phr.} 1. To struggle against someone so as […]

[fight shy of] {v. phr.} To avoid; escape from. * /Jack […]

[fight tooth and nail] See: [TOOTH AND NAIL].

[fighting chance] {n. phr.} A chance that necessitates struggle and courage; […]

[figure in] {v.} 1. {informal} To add to a total; remember […]