To cover, drench, or soak with water.
Combining 'be-' with 'water' (from Old English 'wæter'). This follows the same pattern as bewash, using the prefix to intensify submersion in a liquid.
Agricultural communities would have found 'bewater' essential vocabulary—it describes the thorough soaking of fields, which is why these 'be-' verbs clustered around agricultural and craft terminology.
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