סרי, סָרָה (v. next w.) to become offensive, vitiated; to decay.
Hif. - הִסְרָה to cause to decay; to vitiate. Macc. 5ᵃ (ref. to לענות בו סרה, Deut. XIX, 16) עד שתַּסְרֶה גופה של עדות until thou vitiatest the testimony itself (by proving an alibi of the witness himself).