sweeten
verbUK /ˈswiːtən/
US /ˈswiːtən/
To make something taste sweet by adding sugar or honey.
She sweetened her tea with a spoonful of honey.
OTHER MEANINGS
2. To make something more pleasant or agreeable.
He tried to sweeten the deal with a free gift.
3. To make someone kinder or gentler in manner.
Her kind words sweetened his mood.
4. To add something to make a food or drink less sour or bitter.
A pinch of sugar will sweeten the sauce.