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Related to take aback: taken 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.
Surprise, shock, as in He was taken aback by her caustic remark. This idiom comes from nautical terminology of the mid-1700s, when be taken aback referred to the stalling of a ship caused by a wind shift that made the sails lay back against the masts. Its figurative use was first recorded in 1829.