Fig.: to doubt the capabilities of the counterpart

You claim to be a mechanic? Go climb a tree! I paid you top dollars and my car ran for a whole 20 yards before stopping for good

E tu saresti un meccanico? Ma datti all'ippica! Ti ho pagato fior di soldi e la macchina ha funzionato per ben 20 metri prima di fermarsi definitivamente

The phrase Go take up knitting is often used as a dismissive comment to shut down women who dare to step up, be seen, and voice their opinions