BT Git 56a(50) :דאינהו ידעי דחייא קליל ממתא‏ : they know that a living person is lighter than a dead one
See the entire entry for qallīl adj. light; quick; few

BT Git 56a(50)var. :דאינהו ידעי/קשבי/ דחייא קליל ממתא‏ : for if they know/are aware/ that a living being is lighter than a dead one †
See the entire entry for qšb vb. to be aware