cut someone some slack

(N. Amer. informal)allow someone some leeway in their conduct

(北美，非正式)允许某人行为有些余地

take (或 pick up) the slack

use up a surplus or improve the use of resources to avoid an undesirable lull in business

抓紧松弛环节，治理整顿（指利用盈余或提高资源使用率以避免不良的生意停滞）

as domestic demand starts to flag, foreign demand will help pick up the slack.

由于国内需求开始萎缩，外贸需求将有助弥补损失。

pull on the loose end or part of a rope in order to make it taut

拉紧松弛的绳索

slack off

To decrease in activity or intensity.

放松，缓和：在活动或紧张方面下降