cordon sanitaire
Concise Oxford English Dictionary © 2008 Oxford University Press:
cordon sanitaire /ˌkɔːdɒ̃ sanɪˈtɛː/
▶noun (pl. cordons sanitaires pronunc. same)
- 1 a guarded line preventing anyone from leaving an area infected by a disease.
- 2 a measure designed to prevent communication or the spread of undesirable influences.
– origin C19: Fr., lit. ‘sanitary line’.
'cordon sanitaire' also found in these Oxford entries:

