lighten

verb

1.
make more cheerful
buoy up lighten up
Antonym:
weigh down
2.
reduce the weight on; make lighter
alighten
3.
become more cheerful
buoy up lighten up
4.
make more cheerful through the use of color
brighten lighten up
5.
become lighter
lighten up
Antonym:
darken
6.
alleviate or remove (pressure or stress) or make less oppressive
ME alighte relieve