abate, subside, wane, ebb mean to die down in force or intensity. abate stresses the idea of progressive diminishing <the storm abated>. subside implies the ceasing of turbulence or agitation <the protests subsided after a few days>. wane suggests the fading or weakening of something good or impressive <waning enthusiasm>. ebb suggests the receding of something (as the tide) that commonly comes and goes <the ebbing of daylight>.