sweetens
v.
使甜，变甜( sweeten的第三人称单数 );
送礼以说服;
例句:
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FruIt'sweetens as it ripens.
水果成熟后就好吃了.
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Hunger sweetens what is bitter.
饥者易为食.
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Business sweetens pleasure, and labour sweetens rest.
工作后消遣更愉快, 劳动后休息更舒畅.
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But he brings a British folk lyricism, too, that deepens and sweetens the brew.
来自BBC