| fall | (noun) a sudden drop from an upright position | Synonyms: spill, tumble |
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| (noun) the act of surrendering (usually under agreed conditions) | Synonyms: capitulation, surrender |
| (noun) a lapse into sin; a loss of innocence or of chastity | - |
| (noun) a sudden sharp decrease in some quantity | Synonyms: dip, drop, free fall |
| (noun) a free and rapid descent by the force of gravity | Synonyms: drop |
| (noun) a sudden decline in strength or number or importance | Synonyms: downfall |
| (noun) when a wrestler's shoulders are forced to the mat | Synonyms: pin |
| (noun) a movement downward | - |
| (noun) a downward slope or bend | Synonyms: declension, declination, decline, declivity, descent, downslope |
| (noun) the season when the leaves fall from the trees | Synonyms: autumn |
| (noun) the time of day immediately following sunset | Synonyms: crepuscle, crepuscule, dusk, evenfall, gloam, gloaming, nightfall, twilight |
| fallaciousness | (noun) result of a fallacy or error in reasoning | - |
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| fallacy | (noun) a misconception resulting from incorrect reasoning | Synonyms: false belief |
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| fallal | (noun) cheap showy jewelry or ornament on clothing | Synonyms: bangle, bauble, gaud, gewgaw, novelty, trinket |
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| fallback | (noun) to break off a military action with an enemy | Synonyms: disengagement, pullout |
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| fallboard | (noun) the hinged protective covering that protects the keyboard of a piano when it is not being played | Synonyms: fall-board |
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| faller | (noun) a person who falls | - |
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| (noun) a person who fells trees | Synonyms: feller, logger, lumberjack, lumberman |
| fallibility | (noun) the likelihood of making errors | - |
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| falloff | (noun) a noticeable deterioration in performance or quality | Synonyms: drop-off, falling off, slack, slump |
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| fallout | (noun) any adverse and unwanted secondary effect | Synonyms: side effect |
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| (noun) the radioactive particles that settle to the ground after a nuclear explosion | Synonyms: radioactive dust |
| fallow | (noun) cultivated land that is not seeded for one or more growing seasons | - |
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| falls | (noun) a steep descent of the water of a river | Synonyms: waterfall |
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| (noun) the petals or sepals of a flower that bend downward (especially the outer perianth of an iris) | - |