PTTan 66.a:47[2] :והוה ר׳ לעזר מצטער אמ׳ שבקין סתמא ועבדין כיחידיא‏ : PN would be troubled and say "does one abandon the unspecified opinion and act according to the single opinion?"
See the entire entry for ṣˁr vb. to suffer; to be disgraced