is a doubtful compd. of kassati, the combd. ava + pa occurring only in this word. In all likelihood it is a distortion of vavakassati (vi + ava + kassati), supplementing the ordinary apakassati. See meaning & further discussion under apakāsati- Vin.ii.204 (apakāsati + ; variant reading avapakassati Bdhgh. in expln. on p. 325 has apapakāsati which seems to imply (a)vavakassati); AN.iii.145 sq. (avapakāsituṃ).
ava + pa + kāsati = kassati, fr. kṛṣ