move downward and lower, but not necessarily all the way; "The temperature is going down"; "The barometer is falling"; "The curtain fell on the diva"; "Her hand went up and then fell again"
be the essential element; "The proposal boils down to a compromise"
fall from clouds; "rain, snow and sleet were falling"; "Vesuvius precipitated its fiery, destructive rage on Herculaneum"