Focus on the pronunciation of divider
English definition of “divider”
/dɪˈvaɪdər/ noun [C] WORKPLACE
› a flat object that is used to separate parts of a room, different working areas, etc.: The office is a large, open-plan environment with desks and dividers. Portable sound-absorbent room dividers allow the area to be sectioned to suit your requirements.
› an object that is used to separate particular pages or sections in a set of papers: Included with the package are four ring binders with dividers, index, and 'how to use' information. We sell printed and blank divider tabs online.