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sweet‧en

1 [intransitive and transitive] to make something sweeter, or become sweeter :
Sweeten the mixture with a little honey.
Sweeten the mixture with a little honey.2 [transitive] also sweeten somebody ↔ up informal to try to persuade someone to do what you want, by giving them presents or money or promising them something :
a cash bonus to sweeten the deal ➔ sweetener (2)
a cash bonus to sweeten the deal3 [transitive] literary to make someone kinder, gentler etc :
Old age had not sweetened her.
Old age had not sweetened her.