IPA: /dɪˈbɑːr/
KK: /dɪˈbɑr/
To prevent someone from doing something or to exclude them from a place or activity.
The school decided to debar students who did not follow the rules from participating in the event.
Past: debarred
Past Participle: debarred
Debar is formed from "de-" (meaning down or away) and "barra" (from Latin *barra*, meaning barrier or bar). The word means to remove or keep someone away from something, as if putting a barrier in their way.
Think of 'removing' ('de-') someone from a 'barrier' ('barra') — that's why debar means to keep someone away from something.