Short from 'owy; alas! -- woe.
see HEBREW 'owy
H337. i
III. אִי interjection (so in Rabb, see DeKoh 197 WrEccl 490) alas! (late) Ecclesiastes 4:10 לוֺ אִי (written in ᵑ0 as one word) alas for him (Ew§ 309 c), the one, who falleth, etc. (i.e. who falleth alone) 10:16.