lighten

Concise Oxford English Dictionary © 2008 Oxford University Press:
lighten1

▶verb

• 1 make or become lighter in weight.

• 2 make or become less serious.

Concise Oxford English Dictionary © 2008 Oxford University Press:
lighten2

▶verb

• 1 make or become lighter or brighter.

• 2 (it lightens, it is lightening, etc.) rare flash with lightning.

• 3 archaic enlighten spiritually.