Wind"fall` (?), n.
Anything blown down or off by the wind, as fruit from a tree, or the tree itself, or a portion of a forest prostrated by a violent wind, etc.
"They became a windfall
upon the sudden."
An unexpected legacy, or other gain.
He had a mighty windfall out of doubt.
<-- windfall profits. profits obtained due to a chance ot unanticipated event that causes an asset to increase unexpectedly in value. In contrast to profits earned as the normal and expected yield of an enterprise. -->
© Webster 1913.