קְשַׁב, ch.same, to be attentive, watchful. Gitt. 56ᵃ דאינהו קַשְׁבֵי דחייא וכ׳ Ar. (ed. ידעי) read: דאינהו ק׳ וידעי דחייא וכ׳ for they are watchful (distrustful), and they know that a live body is lighter &c.