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According to Festus, from ob- +‎ Ancient Greek ἄχυρον (ákhuron, “chaff, bran”) +‎ -ō. Alternatively formed within Latin on its cognate acus (“chaff, bran”, oblique stem in acer-) (pre-classical or rare).

obacerō (present infinitive obacerāre, perfect active obacerāvī, supine obacerātum); first conjugation (only attested in a gloss from Festus)

^ 2nd century CE (Sextus Pompeius Festus), De Significatione Verborum (in Latin), page 187: “Obacerare obloqui atque alterius sermonem moleste impedire; quod sumptum videtur a paleis, quas Gracci ἄχυρα vocant. Itaque ut frumentum et panis non sine paleis acerosus dicitur; item lutum aceratum paleis mixtum.”

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