US-P01.026ab ।US-P01.026cd ॥
In plain words
Take the root sad, set upa and ni before it, add the suffix kvip, and you have the word upaniṣad. The name fits: this knowledge slackens the hold of saṃsāra, and it cuts down birth in the womb and everything that follows from it.
Close to the Sanskrit
Of the root √sad, which is preceded by upa and ni, with kvip also, the word 'upaniṣad' would come to be — from the sense of making slack, and likewise from the destroying of womb-birth and the rest.