Bekhorot 31: words to know

בְּמַאי עָסְקִינַן (bema'i askinan): What situation are we dealing with?. The Gemara uses this standard query to analyze the case envisioned by the baraita.
יָחִיד מוּמְחֶה (yaḥid mumḥeh): a single expert authority. Used to explain that a single qualified expert may inspect others' firstborn animals.
פְּסוּלֵי הַמּוּקְדָּשִׁין (pesulei hamukdashin): disqualified consecrated sacrificial animals. Introduces the mishna's discussion on selling animals that developed blemishes and were redeemed.
הַעֲמָדָה וְהַעֲרָכָה (ha'amada ve-ha'arakha): standing and valuation before a priest. Raised as a biblical requirement that normally prevents redeeming an animal post-slaughter.
בְּהַבְלָעָה (behavla'ah): by inclusion into another payment. Refers to selling prohibited animal tithe meat by absorbing its cost into permissible parts.