Sweeten (verb)

1. To make something sweet, typically by adding sugar.
2. To make something more pleasant or attractive.
3. To make something less bitter or sour.

Origin:

From the old english word "swētian" meaning to make sweet.

Examples:

1. She sweetened her tea with honey.
2. I will sweeten the deal by offering a discount.
3. He sweetened the bitter medicine by adding a spoonful of sugar.
4. She sweetened the proposal with a few incentives.
5. He sweetened the mood by telling a joke.