Etymology

Noun

1. A groom, or servant with responsibility for the horses.
   • 1888, Here all trace of him was lost, until a sais or groom met me on the Simla Mall with this extraordinary note — Rudyard Kipling, ‘Miss Youghal's Sais’, Plain Tales from the Hills (Folio Society 2007, p. 25)

Verb

1. first-, second-person singular indicative present of savoir

   je ne sais pas = I do not know