Declining from vigour, prosperity, etc.; failing, decaying, flagging.

figurative and in figurative contexts. Characterized by or involving a steady decline in a person's condition or performance; deteriorating…

That is falling down or in a downward direction; (also figurative) that is falling into disgrace or ruin; declining, decaying. Also: that leads to…

Falling off from vigour, excellence, or prosperity; becoming weaker or worse; failing, waning, decaying (in health, fortunes, etc.); in a decline.

Of a person's fortunes: Declining. Obsolete.

figurative. Lapsing into ruin or decline; failing.

Decreasing or declining in importance, power, influence, etc. (See the senses of the verb.)

gen. Dissolving, disappearing, or melting away (literally or figuratively); tending or liable to do this. Frequently humorous.