Hatran

šḥḳ - to laugh, smile kindly on s.o. (DNWSI 1121)

From *ŝḥḳ, dissimilated from *ṣ̂ḥḳ?

PWS
*ṣ̂ḥk/ṣ̂ḥḳ - to laugh (SED I 70ᵥ)
The level of reconstruction is uncertain due to semantic difficulties concerning the possible Akkadian cognate.