Meaning of ABACK in English
a ‧ back /əˈbæk/ BrE AmE adverb
[ Date: 1100-1200 ; Language: Old English ; Origin: on bæc 'backward' ]
be taken aback (by something) to be very surprised or shocked by something:
For a moment, I was completely taken aback by her request.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012