BT BB 138a(18) :והאי דלא צווח עד השתא סבר כי לא מטי לי מאי אצווח‏ : the reason he did not protest until now (was that) he thought: 'Why should I protest as long as it has not come into my possession?'
See the entire entry for ṣwḥ vb. to cry out