counterflood UK /ˈkaʊn.təːˌflʌd/US /ˈkaʊ.dɚˌflʌd/noun 1verb 1forms 3 noun1 •A flood, or large influx of something, that counteracts another. verb1 •To flood (part of a vessel) deliberately in order to counterbalance flooding already occurring on the other side or end of the vessel, so as to remain on an even keel and avoid capsizing or plunging. formscounterflooded · counterflooding · counterfloods