Flood

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Old English flōd, of Germanic origin; related to Dutch vloed and German Flut, also to flow.

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From Middle English flod, from Old English flōd, from Proto-West Germanic *flōdu, from Proto-Germanic *flōduz, from *plew-(“to flow”). Cognate with Scots flude, fluid, Saterland Frisian Floud, Dutch vloed, German Flut, Danish flod, Icelandic flóð, and Gothic 𐍆𐌻𐍉𐌳𐌿𐍃( flōdus).

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flood (n.)

Old English flōd "a flowing of water, tide, an overflowing of land by water, a deluge, Noah's Flood; mass of water, river, sea, wave," from Proto-Germanic *floduz "flowing water, deluge" (source also of Old Frisian flod, Old Norse floð, Middle Dutch vloet, Dutch vloed, German Flut, Gothic flodus), from suffixed form of PIE verbal root *pleu- "to flow" (also the source of flow). In early modern English often floud. Figurative use, "a great quantity, a sudden abundance," by mid-14c.

flood (v.)

1660s, "to overflow" (transitive), from flood (n.). Intransitive sense "to rise in a flood" is from 1755. Related: Flooded; flooding.