Make more cheerful:
— The conversation lightened me up a bit.

synonyms: buoy up, lighten up.

Roget 320: be light etc. adj.; float, rise, swim, be buoyed up.    render light etc. adj.; lighten, leaven.   

Reduce the weight on; make lighter.

Dutch: verlichten

Become more cheerful:
— After a glass of wine, he lightened up a bit.

synonyms: buoy up, lighten up.

Make more cheerful through the use of color.

synonyms: brighten, lighten up.

Roget 420: shine, glow, glitter; glister, glisten; twinkle, gleam; flare, flare up; glare, beam, shimmer, glimmer, flicker, sparkle, scintillate, coruscate, flash, blaze; be bright etc. adj.; reflect light, daze, dazzle, bedazzle, radiate, shoot out beams; fulgurate.    clear up, brighten.    lighten, enlighten; levin^†; light, light up; irradiate, shine upon; give out a light, hang out a light; cast light upon, cast light in, throw light upon, throw light in, shed light upon, shed luster upon; illume^†, illumine, illuminate; relume^†, strike a light; kindle etc. (set fire to) 384.    ... show more

Become lighter:
— The room lightened up.

synonym: lighten up.

Dutch: oplichten
Polish: rozjarzenie się, rozjaśnienie się, rozpromienienie się, rozświetlenie się, rozproszenie się

Alleviate or remove (pressure or stress) or make less oppressive:
— Lighten the burden of caring for her elderly parents.

synonym: relieve.

Roget 705: be easy etc. adj.; go on smoothly, run smoothly; have full play etc. n.; go on all fours, run on all fours; obey the helm, work well.    flow with the stream, swim with the stream, drift with the stream, go with the stream, flow with the tide, drift with the tide; see one's way; have all one's own way, have the game in one's own hands; walk over the course, win at a canter; make light of, make nothing of, make no bones of.    be at home in, make it look easy, do it with one's eyes closed, do it in one's sleep etc. (skillful) 698.    render easy etc. adj.; facilitate, smooth, ease; popularize; lighten, lighten the labor; free, clear; disencumber, disembarrass, disentangle, disengage; deobstruct^†, unclog, extricate, unravel; untie the knot, cut the knot; disburden, unload, exonerate, emancipate, free from, deoppilate^†; humor etc. (aid) 707; lubricate etc. 332; relieve etc. 834.    leave a hole to creep out of, leave a loophole, leave the matter open; give the reins to, give full play, give full swing; make way for; open the door to, open the way, prepare the ground, smooth the ground, clear the ground, open the way, open the path, open the road; pave the way, bridge over; permit etc. 760.    ... show more