aback
/əˈbæk/
/əˈbæk/
/əˈbæk/
adverb
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Towards the back or rear; backwards.
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In the rear; a distance behind.
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By surprise; startled; dumbfounded. (see usage)
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Backward against the mast; said of the sails when pressed by the wind from the "wrong" (forward) side, or of a ship when its sails are set that way.
noun
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An abacus.