ìbó noun /ì.bó/
Definitions
  1. The name for several plants of the family Apocynaceae that are known for their sour taste. They include Landolphia dulcis, Ancylobotrys scandens (from the genus Ancylobothrys), Saba comorensis, species, and Saba thompsonii.
    ẹmu náàá kan bí ìbó the palm wine was as sour as the ìbó plant
  2. death euphemistic
    ọmọ́ lọ ká ìbó The child is dead
Source: Wiktionary · etymology 2, where this word is spelled “ibo”. Reference: en-ibo-yo-noun-vgIUou77