Vocabulary
不意を打つ
ふいをうつ
to take (a person) unawares; to make a surprise attack
expression
verb
Example sentences
不意（ふい）を討（う）たれて私（わたし）は何（なに）も言（い）う事（こと）を思（おも）い付（つ）かなかった。
Taken by surprise, I couldn't think of anything to say.
不意（ふい）を打（う）たれて、私（わたし）は返事（へんじ）に困（こま）った。
Taken by surprise, I was at a loss for what to answer.