This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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verb-intransitive. To express polite refusal.

verb-intransitive. To slope downward; descend.

verb-intransitive. To bend downward; droop.

verb-intransitive. To degrade or lower oneself; condescend.

verb-intransitive. To deteriorate gradually; fail.

verb-intransitive. To sink, as the setting sun.

verb-intransitive. To draw to a gradual close; wane.

v. To refuse politely: I declined their offer of help. See Synonyms at refuse1.

v. To cause to slope or bend downward.

v. Grammar To inflect (a noun, a pronoun, or an adjective) for number and case.

n. The process or result of declining, especially a gradual deterioration.

n. A downward movement.

n. The period when something approaches an end.

n. A downward slope; a declivity.

n. A disease that gradually weakens or wastes the body.

n. Downward movement, fall.

n. A sloping downward, e.g. of a hill or road.

n. A weakening.

n. A reduction or diminution of activity.

v. To move downwards, to fall, to drop.

v. To become weaker or worse.

v. To refuse, forbear.

v. To list the inflected forms of a noun, pronoun (and in some languages adjective) for case and number.

verb-intransitive. To bend, or lean downward; to take a downward direction; to bend over or hang down, as from weakness, weariness, despondency, etc.; to condescend.

verb-intransitive. To tend or draw towards a close, decay, or extinction; to tend to a less perfect state; to become diminished or impaired; to fail; to sink; to diminish; to lessen

verb-intransitive. To turn or bend aside; to deviate; to stray; to withdraw

verb-intransitive. To turn away; to shun; to refuse; -- the opposite of accept or consent.

v. To bend downward; to bring down; to depress; to cause to bend, or fall.

v. To cause to decrease or diminish.

v. To put or turn aside; to turn off or away from; to refuse to undertake or comply with; reject; to shun; to avoid

v. To inflect, or rehearse in order the changes of grammatical form of.

v. To run through from first to last; to repeat like a schoolboy declining a noun.

n. A falling off; a tendency to a worse state; diminution or decay; deterioration; also, the period when a thing is tending toward extinction or a less perfect state

n. That period of a disorder or paroxysm when the symptoms begin to abate in violence.

n. A gradual sinking and wasting away of the physical faculties; any wasting disease, esp. pulmonary consumption.

To cause to bend or slope; bend down; incline; cause to assume an inclined position; depress.

To lower; degrade; debase.

To decrease; diminish; reduce.

To cause to deviate from a straight or right course; turn aside; deflect.

To turn aside from; deviate from.

To avoid by moving out of the way; shun; avoid in general.

To refuse; refuse or withhold consent to do, accept, or enter upon: as, to decline a contest; to decline an offer.

In grammar, to inflect, as a noun or an adjective; give the case-forms of a noun or an adjective in their order: as, dominus, domini, domino, dominum, domine.

To bend or slant down; assume an inclined position; hang down; slope or trend downward; descend: as, the sun declines toward the west.

To deviate from a right line; specifically, to deviate from a line passing through the north and south points.

To deviate from a course or an object; turn aside; fall away; wander.

To sink to a lower level; sink down; hence, figuratively, to fall into an inferior or impaired condition; lose strength, vigor, character, or value; fall off; deteriorate.

To stoop, as to an unworthy object; lower one's self; condescend.

To refuse; express refusal: as, he was invited, but declined.

To approach or draw toward the close.

To incline; tend.

To incline morally; be favorably disposed.

n. A bending or sloping downward; a slope; declivity; incline.

n. A descending; progress downward or toward a close.

n. A failing or deterioration; a sinking into an impaired or inferior condition; falling off; loss of strength, character, or value; decay.

n. In medicine: That stage of a disease when the characteristic symptoms begin to abate in violence.

n. A popular term for any chronic disease in which the strength and plumpness of the body gradually diminish, until the patient dies: as, he is in a decline.

n. The time of life when the physical and mental powers are failing. Quain.

In chess, to refuse to take a piece or pawn offered.

v. go down

n. change toward something smaller or lower

n. a gradual decrease; as of stored charge or current

n. a condition inferior to an earlier condition; a gradual falling off from a better state

v. go down in value

v. inflect for number, gender, case, etc.,

v. show unwillingness towards

v. refuse to accept

v. grow worse

n. a downward slope or bend

v. grow smaller

"By now the manner of writing about a Pope in decline is as ritualized as a Holy Thursday mass at Saint Peter's."

incline   

declined    declines    declining   

godown    fall    descend    comedown    inflect   

descent    disease    ailment    deviate    descend    refuse    inflect    declining dial   

dishonor    dishonour    bounce   

declination    declension   

fail    sink    diminish    lessen    deviate    stray    withdraw    shun    refuse    depress   

Aline    Cline    Combine    Dine    Heine    Jain    Klein    Kline    Quine    Rhine   

decrease    increase    collapse    rise    gain    trend    expansion    loss    decay    crisis