lighten

Từ điển American Heritage Dictionary 4th

I. light·en¹ (lītʹn)v. light·ened, light·en·ing, light·ensv. tr.
1.
a. To make light or lighter; illuminate or brighten.
b. To make (a color) lighter.
2. Archaic. To enlighten.v. intr.
1. To become lighter; brighten.
2. To be luminous; shine.
3. To give off flashes of lightning. II. light·en² (lītʹn)v. light·ened, light·en·ing, light·ensv. tr.
1. To make less heavy.
2. To lessen the oppressiveness, trouble, or severity of. See Synonyms at relieve.
3. To relieve of cares or worries; gladden.v. intr.
1. To become less in weight.
2. To become less oppressive, troublesome, or severe.
3. To become cheerful.Phrasal Verb:lighten up Informal
To take matters less seriously:
Everything will work out fine, so stop worrying and lighten up.

• Từ đồng nghĩa / Synonyms:
  relieve, lighten up, brighten, buoy up
• Từ trái nghĩa / Antonyms:
  darken, weigh down, weigh on