sweeten

To make sweet or sweeter by adding sugar, honey, saccharin, or another sweet substance.

To make more pleasant or agreeable.

To soften or soothe.

To make bearable; alleviate.

To increase the value of (collateral for a loan) by adding more securities.

To enhance the attractiveness or financial desirability of (an offer, for example).

To increase the value of (an unwon poker pot) by adding stakes before reopening.

To make less acidic.

To remove sulfur compounds from (fuel oil or gas).