be all sweetness and lighta) to behave in a way that is very pleasant and friendly, especially when you do not normally behave like this 〔尤指一反常态地〕和蔼可亲，亲切友善 She’s all sweetness and light when Paul’s around. 有保罗在，她就表现得特别甜美可爱。
b) to be enjoyable and without problems 顺利，顺顺当当 Life is not all sweetness and light. 生活并不总是一帆风顺的。
be all sweetness and light• The negotiations were not all sweetness and light.
→ be all sweetness and light at sweetness(1)