Ant. Suppress, withhold, conceal.
Decline. Fall, decay, decadence, degeneration; refusal, rejection, repudiation.
Ant. Rise, advancement, improvement; acceptance.
Declivity. Fall, slope, descent.
Ant. Ascent, rise.
Decoction. Concoction, mixture, mess.
Ant. Rawness. crudity.
Decompose. Analyze, dissolve, resolve; decay, putrefy, become corrupt.
Ant. Compound, mix, organize, compose.
Decorate. Adorn, embellish, improve.