Sweeten

verb

1. To make sweet to the taste.

   "to sweeten tea"

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

   "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.