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The definition of decline

Synonyms:	fall, refuse, recession, deteriorate, depression, slump, downturn, dwindle, lessen, diminution, abatement, failing, weaken, decay, worsen, descent, disintegrate, degeneration, atrophy, enfeeble, fail, drop, contract, lower, sink, flag, fade, shrink, diminish, decrease, fall off, wane, ebb, slacken, pine, lapse, languish, degenerate, droop, reject, turn down, avoid, deny, spurn, abstain, forgo
Antonyms:	rise, improvement, improve, accept

From Collins