plunging /ˈplʌn.d͡ʒɪŋ/adjective 3noun 2forms 1 adjective3 •That descends steeply. •Aimed from higher ground, as fire upon an enemy. •Very low-cut. noun2 •An occurrence of putting or sinking under water or other fluid. •A headlong violent motion like that of a horse trying to throw its rider.It pulled up with a mighty plunging of horses at the overturned chaise. — 1936 formsplungings