1. To make sweet to the taste.
    to sweeten tea
  2. To make pleasing or grateful to the mind or feelings.
    to sweeten life
    to sweeten friendship
  3. To make mild or kind; to soften.
    to sweeten the temper
  4. To make less painful or laborious; to relieve.
    to sweeten the cares of life
  5. To soften to the eye; to make delicate.
  6. To make pure and salubrious by destroying noxious matter.
    to sweeten rooms or apartments that have been infected
    to sweeten the air
  7. To make warm and fertile.
    to dry and sweeten soils
  8. To restore to purity; to free from taint.
    to sweeten water, butter, or meat
  9. To make more attractive;
    to sweeten the deal by increasing the price offered
  10. To become sweet.

The above text is a snippet from Wiktionary: sweeten
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