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3. a chink in armour

a chink in armour

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a chink in somebody's armour

  (British & Australian) also a chink in somebody's armor (American & Australian)

if someone or something which seems to be strong has a chink in their armour, they have a small fault which may cause them problems She's a brilliant businesswoman, but her lack of political awareness may be the chink in her armour.

See also: armour, chink