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alack

[uh-lak]
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interjection Archaic.
  1. (used as an exclamation of sorrow, regret, or dismay.)
Also a·lack·a·day [uh-lak-uh-dey] /əˈlæk əˌdeɪ/.

Origin of alack

presumably ah + lack. Cf. aha, ahem, alas
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for alack

alack

alackaday (əˈlækəˌdeɪ)

interjection
  1. an archaic or poetic word for alas

Word Origin

C15: from a ah! + lack loss, lack
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for alack

late 15c., from ah, lack, from lack in Middle English sense of "loss, failure, reproach, shame." Originally an expression of dissatisfaction, later of regret or unpleasant surprise.

Online Etymology Dictionary, © 2010 Douglas Harper