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acetylide
acetylsalicylic acid
acey-deucy
ACH
ach
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Achilles heel
A·chil·les heel (plural A·chil·les heels)


noun 
Definition:
 
small but fatal weakness: a weakness that seems small but makes somebody or something fatally vulnerable
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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