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- Two dozen of them flurried, wavering, indecisive, three miles off, like butterflies puzzled by autumn, and then they were plummeting down to land, one by one, here, there, softly kneading the streets where, turned back to beetles, they shrieked along the boulevards or, as suddenly, leapt back into the air, continuing their search.p. 119.1
plummeting = falling straight
There are no more uses of "plummet" in Fahrenheit 451.
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