Take (one) aback American British verb phrase
To surprise, astound, or disturb
It took us aback to realize that the man we have talked on the lobby is our new manager.
The death toll of Covid 19 in India takes everyone aback, and become worrier with this complicated state of the pandemic.
The reason hidden behind the supervisor's resignation took all employees aback.
To be surprised by some sudden occurrence
To greatly surprise, shock, or confuse someone
The verb "take" should be conjugated according to its tense.