Set one aback phrase
To make someone feel surprised, shocked, or confused.
Would it set you aback to know that we're going to get married next week?
He loves setting me aback by giving me something special that he made on my birthday.
The first time we heard Mary sing, we were all set aback by her mellifluous voice.
To be surprised by some sudden occurrence
To greatly surprise, shock, or confuse someone
To be startled or surprised while unprepared; to be put in a difficult or disadvantageous situation when something happens which one does not expect
An exclamation of shock or surprise
The verb "set" must be conjugated according to its tense.
This phrase is a less common variant of "take one aback."