In Gbaya, the notion of large crowds is emphasized with the ideophone súm-súm that expresses being numerous, crowded together, when talking about people, trees, etc. Note that in Hosea 10:8 súm-súm refers to the large number of thorns and thistles.
Ideophones are a class of sound symbolic words expressing human sensation that are used as literary devices in many African languages. (Source: Philip Noss)