debar
Concise Oxford English Dictionary © 2008 Oxford University Press:
debar/dɪˈbɑː(r)/
▶verb (debars, debarring, debarred) exclude or prohibit from doing something.
– derivatives
debarment noun.
debarment noun.
– origin ME: from Fr. débarrer, from OFr. desbarrer ‘remove the bars from’, from des- (expressing reversal) + barrer ‘to bar’.
'debar' also found in these Oxford entries:

