take someone aback
take (one) aback
To startle, astonish, shock, or disconcert one. It took us all aback a bit to learn that John was moving to England next month. I'm sure the news of the merger takes everyone aback, but please believe me that this is in the best interest of the company.
take someone abackshock, surprise, or disconcert someone.
The phrase is frequently used in the passive form (be taken aback ): this was adopted in the mid 19th century from earlier (mid 18th-century) nautical terminology, to describe the situation of a ship with its sails pressed back against the mast by a headwind, preventing forward movement.
1991 Kathleen Jones Learning Not To Be First They were taken aback by the shabbiness of the hotel and lack of cleanliness in the city generally.