the.com/rain cloud

A sky-based mood swing that waters your garden and ruins your picnic.

means A cloud dense with condensed water vapor that's heavy enough to release precipitation.

from A plain compound — 'rain' and 'cloud' fused by function, not fable. 'Rain' traces back through Old English 'regn' to a very old Germanic root, while 'cloud' comes from Old English 'clud,' which originally meant a mass of rock or a hill — clouds were seen as rocky-looking lumps in the sky before the word drifted to mean the vapory kind. No single coiner, no clever twist — just centuries of English speakers needing a word for 'the gray one that's about to ruin everything.'

actual weight
average one holds over a million pounds of water
why it floats
droplets are smaller than air's upward push
color science
gray means thick, light-blocking, about to dump rain
idiom hijack
became shorthand for gloom long before meteorology existed
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