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Dabble: verb - moisten or soil by sprinkling, splashing, or dipping into water or other liquid; move, splash
Hands or feet in water, move the feet, hands, etc., in shallow water, paddle; work at something in a desultory manner; meddle, interfere.
'Under the burning sun, Georgina and Cindy dabbled their feet in the fountain to bring some relief from the heat wave that all but consumed the city.'
'David dabbled his handkerchief in the river to wash away the blood after murdering his wife's lover.'