sweeten.

To make sweet to the taste.

to sweeten tea

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

to sweeten life

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 healthful by destroying noxious matter.

to sweeten the air

to sweeten rooms or apartments that have been infected

To make warm and fertile.

to dry and sweeten soils

To raise the pH of (a soil) by adding alkali.

To restore to purity; to free from taint.

to sweeten water, butter, or meat

To make more attractive; said of offers in negotiations.

to sweeten the deal by increasing the price offered

To become sweet.

To supplement (a composition) with additional instruments, especially strings.