instrumental to go wrong, to fail, disagree; to be troubled; also (trs.) to do harm, to injure SN.iii.119; SN.iv.184 = Cnd.40 (by˚); AN.iii.101 (bhattaṃ me vyāpajjeyya disagrees with me, makes me ill); Snp.1065 (ākāso avyāpajjamāno not troubled, not getting upset) Cnd.74 (by˚)
pp vyāpanna
caus vyāpādeti.

vi + āpajjati