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Aback

adverb

/əˈbæk/

Meaning

by surprise; unexpectedly

I was taken aback by his sudden announcement.

surprised, startled, shocked

prepared, expected, unsurprised

taken aback, caught aback, put aback

without making careful distinctions; randomly; without discrimination

in accordance with what is required or appropriate; at the proper time

at the present time; now

at a later time; after an event or time that has already been mentioned

At a rapidly increasing rate; growing or expanding very quickly and intensely.

on this day; at the present time