Synonyms of aback in English:

aback

adverb

Phrases

take someone aback

everyone in the church was taken aback when the groom's ex-wife stood up and objected to the marriage
surprise, shock, stun, stagger, astound, astonish, startle, take by surprise;
dumbfound, stop someone in their tracks;
shake (up), jolt, throw, unnerve, disconcert, unsettle, bewilder
informal flabbergast, floor, bowl over

Definition of aback in:

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Word of the day demoralize
Pronunciation: dɪˈmɒrəlʌɪz
verb
cause (someone) to lose confidence or hope