to, spring up, burst forth DN.ii.164
pp abbhuṇṇata (& ˚unnata), q.v.; Caus. abbhunnāmeti to stiffen, straighten out, hold up erect DN.i.120 (kāyaṃ one’s body); AN.ii.245 (id.); DN.i.126 (patodalaṭṭhiṃ; opp. apanāmeti to bend down).

abhi, + ud + namati