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n.
a sudden sharp decrease in some quantity; "a drop of 57 points on the Dow Jones index"; "there was a drop in pressure in the pulmonary artery"; "a dip in prices"; "when that became known the price of their stock went into free fall"
v.
touch or seem as if touching visually or audibly; "Light fell on her face"; "The sun shone on the fields"; "The light struck the golden necklace"; "A strange sound struck my ears"
v.
be inherited by; "The estate fell to my sister"; "The land returned to the family"; "The estate devolved to an heir that everybody had assumed to be dead"
n.
moral perversion; impairment of virtue and moral principles; "the luxury and corruption among the upper classes"; "moral degeneracy followed intellectual degeneration"; "its brothels, its opium parlors, its depravity"; "Rome had fallen into moral putrefaction"
n.
a natural event caused by something suddenly falling down or caving in; "the roof is in danger of collapse"; "the collapse of the old star under its own gravity"
v.
act in disregard of laws, rules, contracts, or promises; "offend all laws of humanity"; "violate the basic laws or human civilization"; "break a law"; "break a promise"
v.
decrease in size, extent, or range; "The amount of homework decreased towards the end of the semester"; "The cabin pressure fell dramatically"; "her weight fell to under a hundred pounds"; "his voice fell to a whisper"