stagnate /ˈstæɡneɪt/verb 6adjective 1forms 3 verb6 •To cease motion, activity, or progress. •To cease to flow or run.If the water stagnates, algae will grow. •To cease to develop, advance, or change; to become idle.Ready-witted tenderness […] never stagnates in vain lamentations while there is any room for hope. — 1826 •To stop the flowing or running of •To stop the development, advancement, or change of; to make idle. •To be or become foul from standing.Air stagnates in a closed room. adjective1 •Stagnant. formsstagnated · stagnating · stagnates