This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A sudden loss of wealth, rank, reputation, or happiness; ruin.

n. A cause of sudden ruin.

n. A fall of rain or snow, especially a heavy or unexpected one.

n. A precipitous decline in fortune; a rapid deterioration, as in status or wealth.

n. The cause of such a fall; a critical blow or error.

v. To fall down; deteriorate; decline.

n. A sudden fall; a body of things falling.

n. A sudden descent from rank or state, reputation or happiness; destruction; ruin.

n. A falling downward; a fall; descent: as, the downfall of a stream.

n. What falls downward; a waterfall.

n. A pit; an abyss.

n. Descent or fall to a lower position or standing; complete failure or overthrow; ruin: as, the downfall of Napoleon.

n. Waning; decay.

n. A kind of trap in which a weight or missile falls down when the set is sprung; a deadfall. See the extract.

n. failure that results in a loss of position or reputation

n. a sudden decline in strength or number or importance

n. the falling to earth of any form of water (rain or snow or hail or sleet or mist)

"Earth Abides, check, the downfall is a bit of a mystery."

destruction    ruin    fall   

overthrow    demise    dissolution    extinction    collapse    disintegration    subversion    capitulation    annihilation    breakup