Niagara /naɪˈæɡ(ə)ɹə/noun 2verb 1forms 3 noun2 •(figurative) A flood, torrent, or outpouring, especially one of massive proportions.[A] veritable Niagara of loose flesh when her stays are unlaced. — 1883 •A Niagara grape.During the past 25 years, New York wineries have moved away from Niagaras and Delawares and begun producing world-class wines from European grapes and specially cultured hybrids and varietals. — 2004 verb1 •To flood; to pour in a torrent.[…] water deluged into the cockpit and Niagaraed into the bilge. Only constant use of the pump kept the floorboards from going adrift. — 1943 formsNiagaraed · Niagaraing · Niagaras