improve

Từ điển American Heritage Dictionary 4th

im·prove (ĭm-pro͞ovʹ)v. im·proved, im·prov·ing, im·provesv. tr.
1. To raise to a more desirable or more excellent quality or condition; make better.
2. To increase the productivity or value of (land or property).
3. To put to good use; use profitably.v. intr.
1. To become better.
2. To make beneficial additions or changes:
improve on the translation. [Middle English improwen, to enclose land for cultivation, from Anglo-Norman emprouwer, to turn to profit : Old French en-, causative pref. (from Latin in-. See in-²) + Old French prou, profit (from Late Latin prōde, advantageous. See proud).] im·provʹa·ble adj.im·provʹa·bly adv. 
Synonyms: improve, better¹, help, ameliorate
These verbs mean to advance to a more desirable, valuable, or excellent state. Improve and better, the most general terms, are often interchangeable: You can improve (or better) your mind through study; I got a haircut to improve (or better) my appearance. Help usually implies limited relief or change: Gargling helps a sore throat. To ameliorate is to improve circumstances that demand change: Volunteers were able to ameliorate conditions in the refugee camp.

• Từ đồng nghĩa / Synonyms:
  better, ameliorate, meliorate, amend
• Từ trái nghĩa / Antonyms:
  worsen, decline, aggravate, exacerbate, exasperate