The moment does not allow for delay
Used to indicate that something is extremely pressing or urgent
Neutral
全球环境污染日趋严重,保护环境刻不容缓 | Quánqiú huánjìng wūrǎn rìqū yánzhòng, bǎohù huánjìng kèbùrónghuǎn
Pollution around the world grows more and more serious each day. We must brook no delay in protecting the environment
[Source]
我刻不容缓地冲过去跳入水中向他游去 | Wǒ kèbùrónghuǎn de chōng guòqù tiàorù shuǐ zhōng xiàng tā yóu qù
I immediately rushed over, jumped into the water, and swan towards him
[Source]
To brook no delay
None
This is an HSK chengyu
《齐东野语》(Qí Dōng Yě Yǔ), a work by Sòng Dynasty (宋, 960 - 1279) author 周密 (Zhōu Mì)
This chengyu comes from a line in the work listed in the "Origin" section above