顾此失彼

gùcǐ-shībǐ

[take one into consideration to the neglect of the other; attend to one thing and lose sight of another] 两者不能同时兼顾

钱粮输纳, 必有定限, ......限有定而百姓闲时办银, 逢限上纳, 无顾此失彼之虑。 --清·黄六鸿《钱谷比限》