accusative singular neuter of abbhakkhāna (nominal, possibly past participle or gerundive)
Analysis. abbha- (variant of abhi-, "toward, bearing down on") + kkhāna (from √khā, "to dig, speak"); literally "speaking against" or "digging into / refuting".
Etymology. abhi- (toward, confronting) + √khā (speak, proclaim); the prefix gives the sense of confrontation or counter-speech. The root √khā is related to Sanskrit khānati and possibly English "gash"; the concrete image is of cutting or speaking sharply against something.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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