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fallback something to which one can resort in case of failure of one's first efforts. [2 definitions]
fall back on to have recourse, as to another alternative.
fall behind to not keep up with; lag behind.
fall down to fall to the ground.
fallen past participle of fall. [6 definitions]
fall foul of to come into collision, conflict, or entanglement with.
fallible liable to error.
falling-out a quarrel that leads to estrangement.
falling sickness see epilepsy.
falling star a meteor; shooting star.
fall line a geographical line connecting the waterfalls of parallel rivers that indicates a drop in land level. [2 definitions]
fall-off a reduction or decline, as in quantity, vigor, or activity.
fall off to decline, decrease, or diminish.
Fallopian tube in female mammals, one of a pair of narrow ducts that carry ova from the ovaries to the uterus; oviduct.
fallout the fall of radioactive particles, or the particles themselves, that result from a nuclear explosion. [2 definitions]
fallow of farmland, tilled but not planted. [4 definitions]
fallow deer a Eurasian deer that has a yellowish coat with white spots in summer.
fall under to be the concern of. [2 definitions]
false untrue or incorrect. [7 definitions]
false arrest the illegal restraint or detention of a person by another who claims to have legal authority, usu. a police officer.
false bottom a concealed compartment in the bottom of a box, suitcase, or the like.