Meaning

• To make sweet to the taste.

  "to sweeten tea"

• To make (more) pleasant or to the mind or feelings.

  "to sweeten friendship"

• To make mild or kind; to soften.

  "to sweeten the temper"

• To make less painful or laborious; to relieve.

  "to sweeten the cares of life"

• To soften to the eye; to make delicate.

• To make pure and salubrious by destroying noxious matter.

  "to sweeten rooms or apartments that have been infected"

• To make warm and fertile.

  "to dry and sweeten soils"

• To restore to purity; to free from taint.

  "to sweeten water, butter, or meat"

• To make more attractive; said of offers in negotiations.

• To become sweet.