IPA: /ˈbaɪfoʊld/
KK: /ˈbaɪfoʊld/
Having two parts that can fold together.
The bifold doors opened up the room to the outside.
Bifold is formed from "bi-" (meaning two) and "fold" (from Old English "fealdan", meaning to fold). The word "bifold" refers to something that is folded in two parts or sections.
Think of 'two' ('bi-') and 'folding' something — that's why bifold means something that is folded into two parts.