Comments: A participle form from PN *=uc̣- "to be filled, satiated" (Chech. =uz-, Bacb. =uc̣-). It is rather probable, that PN *=ac̣-i(n) 'heavy' (Chech., Ing. =eza, Bacb. =ac̣ĩ, Cheb. =azĩ, Khild. =eʒĭ etc; the pure root is preserved in Chech. =az-dan "make expensive", Bacb. =ac̣-dar "make heavy") is an Ablaut variant of the same stem.