减少出货频率英语可以说成 reduce the frequency of shipments。
其来源可能是为了减少成本或者改善供应链的效率，公司可能希望减少对于一些产品的出货频率。
以下是一些英文例句及其中文翻译：
We need to reduce the frequency of shipments to save on transportation costs. (我们需要减少出货频率以节省运输成本。)
The company has decided to reduce the frequency of shipments for certain products to improve supply chain efficiency. (公司决定减少某些产品的出货频率以提高供应链效率。)
In order to reduce inventory levels, we will have to decrease the frequency of shipments. (为了减少库存水平，我们将必须减少出货频率。)