chargé d'affaires
Concise Oxford English Dictionary © 2008 Oxford University Press:
chargé d'affaires /ˌʃɑːʒeɪ daˈfɛː/ (also chargé)
▶noun (pl. chargés d'affaires pronunc. same) an ambassador's deputy.
■ a state's diplomatic representative in a minor country.
– origin C18: Fr., ‘(a person) in charge of affairs’.
'chargé d'affaires' also found in these Oxford entries:

