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

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v. To make light or lighter; illuminate or brighten.

v. To make (a color) lighter.

v. Archaic To enlighten.

verb-intransitive. To become lighter; brighten.

verb-intransitive. To be luminous; shine.

verb-intransitive. To give off flashes of lightning.

v. To make less heavy.

v. To lessen the oppressiveness, trouble, or severity of. See Synonyms at relieve.

v. To relieve of cares or worries; gladden.

verb-intransitive. To become less in weight.

verb-intransitive. To become less oppressive, troublesome, or severe.

verb-intransitive. To become cheerful.

phrasal-verb. lighten up Informal To take matters less seriously: Everything will work out fine, so stop worrying and lighten up.

v. To alleviate; to reduce the burden of.

v. To make light or lighter in weight.

v. To make less serious or more cheerful.

v. To make brighter or clearer; to illuminate.

v. To become light or lighter in weight.

v. To become less serious or more cheerful.

v. To become brighter or clearer; to brighten.

verb-intransitive. To descend; to light.

verb-intransitive. To burst forth or dart, as lightning; to shine with, or like, lightning; to display a flash or flashes of lightning; to flash.

verb-intransitive. To grow lighter; to become less dark or lowering; to brighten; to clear, as the sky.

v. To make light or clear; to light; to illuminate

v. To illuminate with knowledge; to enlighten.

v. To emit or disclose in, or as in, lightning; to flash out, like lightning.

v. To free from trouble and fill with joy.

v. To make lighter, or less heavy; to reduce in weight; to relieve of part of a load or burden

v. To make less burdensome or afflictive; to alleviate.

v. To cheer; to exhilarate.

To become light or lighter; grow light or clear up; brighten: as, the sky lightens.

To emit flashes of lightning; shoot out as lightning; flash. See lightning. The lightning that lighteneth out of the one part under heaven shineth unto the other part.

To make light or bright; give light to; light up.

To illuminate mentally or spiritually; enlighten.

To send forth like lightning.

To become light or less heavy.

To make light or less heavy; reduce in weight; relieve of weight: as, to lighten coin by clipping or abrasion; to lighten a load or a ship.

To make less burdensome or oppressive; alleviate: as, to lighten the cares of life.

To cheer; gladden.

To make lighter in color or shade: as, to lighten the background of a picture.

To descend; settle down; light.

v. make lighter or brighter

v. reduce the weight on; make lighter

v. make more cheerful

v. become lighter

v. become more cheerful

v. alleviate or remove (pressure or stress) or make less oppressive

lightened    lightening    lightens   

change    modify    alter    disburden    unburden    cheer    cheer up    chirk up    mitigate   

alleviate    diminish    brighten    light   

lighten up   

descend    light    brighten    illuminate    enlighten    alleviate    cheer    exhilarate   

Brighton    Titan    Triton    brighten    enlighten    frighten    heighten    tighten    titan    triton