プログレッシブ和英中辞典(第4版)の解説
いひょう【意表】
人の意表を突く［に出る］
take a person by surprise／do something quite unexpected
東欧の事態は政府の意表を突くものだった
Our government was caught off balance [guard] by events in Eastern Europe.
山田氏の外務大臣任命は全く意表を突いたものだった
Mr. Yamada was the last person we had expected to be appointed Foreign Minister.