to be surprised; to be amazed; to be frightened; to be astonished; to get startled; to jump
surprise (e.g. surprise party)
突然の訪問にびっくりした。
I was surprised by the sudden visit.
びっくりして声が出なかった。
I was so surprised I couldn't speak.
びっくり箱を開けた。
I opened the jack-in-the-box.