Apāpurati & Apāpuṇati

to open (a door) Vin.i.5 (apāpur’ etaṃ Amatassa dvāraṃ: imper. where id. p. SN.i.137 has avāpur˚, T., but variant reading apāpur˚) Vv.64#27 (apāpuranto Amatassa dvāraṃ, expl^d. at Vv-a.284 by vivaranto); Iti.80 (apāvuṇanti A. dv. as T. conj. with variant reading apānuṃanti, apāpurenti & apāpuranti)
pp apāruta (q.v.)
pass apāpurīyati [cp. BSk. apāvurīyati Mvu.ii.158] to be opened MN.iii.184 (variant reading avā˚) Ja.i.63 (avā˚); Thig.494 (apāpuṇitvā). See also avāpurati.

Sk. apāvṛṇoti, apa + ā + vṛ; but Vedic only apa-vṛṇoti corresponding to Lat. aperio *apa-ṷerio. On form see Trenckner, Notes 63