Sanskrit for Intermediate (Level 1) – Vyakarana Shastra Pravesha – Starting from Oct, 2023
Learn next level grammar,  Click Here to know more

पिष्टपेषणन्यायः

It is used to denote a superfluous or unprofitable exertion like the attempt of a man to grind pounded flour. Cf. It is of no use to go to do a thing which has already been done.