שְׁסֵי , Pa. שַׁסֵּי same. B. Kam. 24ᵇ כיין … דמְשַׁסֵּי ליה ומִשְׁתַּסֵּי וכ׳ (Ms. R. דמְשַׁסּוּ) since thou knowest of thy dog, that one can set him on and he will bite, thou oughtest not to have kept him.
Ithpa. - אִשְׁתַּסֵּי to be set on, to bite, v. supra.